253391 has 6 divisors (see below), whose sum is σ = 265440. Its totient is φ = 241868.

The previous prime is 253387. The next prime is 253417. The reversal of 253391 is 193352.

It is a happy number.

It is not a de Polignac number, because 253391 - 2² = 253387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 253391.

It is not an unprimeable number, because it can be changed into a prime (253321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 290 + ... + 768.

It is an arithmetic number, because the mean of its divisors is an integer number (44240).

2²⁵³³⁹¹ is an apocalyptic number.

253391 is a deficient number, since it is larger than the sum of its proper divisors (12049).

253391 is an equidigital number, since it uses as much as digits as its factorization.

253391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 502 counting only the distinct ones).

The product of its digits is 810, while the sum is 23.

The square root of 253391 is about 503.3795784495. The cubic root of 253391 is about 63.2796004701.

The spelling of 253391 in words is "two hundred fifty-three thousand, three hundred ninety-one".