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253 (number)
253
(
two hundred [and] fifty-three
) is the
natural number
following
252
and preceding
254
.
In mathematics
253
is:
a
semiprime
since it is the product of 2 primes.
a brilliant number, meaning that its
prime factors
have the same amount of digits
the 22nd
triangular number
.
a
star number
.
a
centered heptagonal number
.
a
centered nonagonal number
.
a
Blum integer
.
a member of the
13-aliquot tree
.
References