31268231 has 2 divisors, whose sum is σ = 31268232. Its totient is φ = 31268230.

The previous prime is 31268221. The next prime is 31268233. The reversal of 31268231 is 13286213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31268231 is a prime.

It is a super-2 number, since 2×31268231² = 1955404539738722, which contains 22 as substring.

Together with 31268233, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31268231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31268233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15634115 + 15634116.

It is an arithmetic number, because the mean of its divisors is an integer number (15634116).

Almost surely, 2^31268231 is an apocalyptic number.

31268231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31268231 is an equidigital number, since it uses as much as digits as its factorization.

31268231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 31268231 is about 5591.8003362066. The cubic root of 31268231 is about 315.0415028880.

The spelling of 31268231 in words is "thirty-one million, two hundred sixty-eight thousand, two hundred thirty-one".