31264231 has 2 divisors, whose sum is σ = 31264232. Its totient is φ = 31264230.

The previous prime is 31264229. The next prime is 31264243. The reversal of 31264231 is 13246213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31264231 - 2¹ = 31264229 is a prime.

It is a super-2 number, since 2×31264231² = 1954904280042722, which contains 22 as substring.

Together with 31264229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31264271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15632115 + 15632116.

It is an arithmetic number, because the mean of its divisors is an integer number (15632116).

Almost surely, 2^31264231 is an apocalyptic number.

31264231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31264231 is an equidigital number, since it uses as much as digits as its factorization.

31264231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

The square root of 31264231 is about 5591.4426582055. The cubic root of 31264231 is about 315.0280683815.

The spelling of 31264231 in words is "thirty-one million, two hundred sixty-four thousand, two hundred thirty-one".