31956013 has 2 divisors, whose sum is σ = 31956014. Its totient is φ = 31956012.

The previous prime is 31956011. The next prime is 31956037. The reversal of 31956013 is 31065913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28281124 + 3674889 = 5318^2 + 1917^2 .

It is a cyclic number.

It is not a de Polignac number, because 31956013 - 2¹ = 31956011 is a prime.

Together with 31956011, 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 (31956011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15978006 + 15978007.

It is an arithmetic number, because the mean of its divisors is an integer number (15978007).

Almost surely, 2^31956013 is an apocalyptic number.

It is an amenable number.

31956013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31956013 is an equidigital number, since it uses as much as digits as its factorization.

31956013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 31956013 is about 5652.9649742414. The cubic root of 31956013 is about 317.3346749182.

The spelling of 31956013 in words is "thirty-one million, nine hundred fifty-six thousand, thirteen".