31252631 has 2 divisors, whose sum is σ = 31252632. Its totient is φ = 31252630.

The previous prime is 31252591. The next prime is 31252657. The reversal of 31252631 is 13625213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31252631 is a prime.

It is a super-2 number, since 2×31252631² = 1953453888844322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31252597 and 31252606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31252231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15626315 + 15626316.

It is an arithmetic number, because the mean of its divisors is an integer number (15626316).

Almost surely, 2^31252631 is an apocalyptic number.

31252631 is a deficient number, since it is larger than the sum of its proper divisors (1).

31252631 is an equidigital number, since it uses as much as digits as its factorization.

31252631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 23.

The square root of 31252631 is about 5590.4052625905. The cubic root of 31252631 is about 314.9891018317.

Adding to 31252631 its reverse (13625213), we get a palindrome (44877844).

The spelling of 31252631 in words is "thirty-one million, two hundred fifty-two thousand, six hundred thirty-one".