253491 has 8 divisors (see below), whose sum is σ = 386304. Its totient is φ = 144840.

The previous prime is 253481. The next prime is 253493. The reversal of 253491 is 194352.

253491 = 128² + 129² + ... + 141².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 253491 - 2⁶ = 253427 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6015 + ... + 6056.

It is an arithmetic number, because the mean of its divisors is an integer number (48288).

2²⁵³⁴⁹¹ is an apocalyptic number.

253491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

253491 is a deficient number, since it is larger than the sum of its proper divisors (132813).

253491 is a wasteful number, since it uses less digits than its factorization.

253491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12081.

The product of its digits is 1080, while the sum is 24.

The square root of 253491 is about 503.4788972738. The cubic root of 253491 is about 63.2879237436.

The spelling of 253491 in words is "two hundred fifty-three thousand, four hundred ninety-one".