2531231 has 4 divisors (see below), whose sum is σ = 2539632. Its totient is φ = 2522832.

The previous prime is 2531209. The next prime is 2531233. The reversal of 2531231 is 1321352.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2531231 - 2⁶ = 2531167 is a prime.

It is a super-2 number, since 2×2531231² = 12814260750722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2531233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3731 + ... + 4356.

It is an arithmetic number, because the mean of its divisors is an integer number (634908).

2^2531231 is an apocalyptic number.

2531231 is a deficient number, since it is larger than the sum of its proper divisors (8401).

2531231 is an equidigital number, since it uses as much as digits as its factorization.

2531231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8400.

The product of its digits is 180, while the sum is 17.

The square root of 2531231 is about 1590.9842865346. The cubic root of 2531231 is about 136.2837034710.

Adding to 2531231 its reverse (1321352), we get a palindrome (3852583).

The spelling of 2531231 in words is "two million, five hundred thirty-one thousand, two hundred thirty-one".