2312531 has 4 divisors (see below), whose sum is σ = 2490432. Its totient is φ = 2134632.

The previous prime is 2312521. The next prime is 2312539. The reversal of 2312531 is 1352132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2312531 is a prime.

It is a super-2 number, since 2×2312531² = 10695599251922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2312539) 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, 88931 + ... + 88956.

It is an arithmetic number, because the mean of its divisors is an integer number (622608).

2^2312531 is an apocalyptic number.

2312531 is a deficient number, since it is larger than the sum of its proper divisors (177901).

2312531 is a wasteful number, since it uses less digits than its factorization.

2312531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177900.

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

The square root of 2312531 is about 1520.7008252776. The cubic root of 2312531 is about 132.2399027219.

Adding to 2312531 its reverse (1352132), we get a palindrome (3664663).

The spelling of 2312531 in words is "two million, three hundred twelve thousand, five hundred thirty-one".