31396913 has 2 divisors, whose sum is σ = 31396914. Its totient is φ = 31396912.

The previous prime is 31396889. The next prime is 31396921. The reversal of 31396913 is 31969313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19918369 + 11478544 = 4463^2 + 3388^2 .

It is a cyclic number.

It is not a de Polignac number, because 31396913 - 2⁸ = 31396657 is a prime.

It is a super-2 number, since 2×31396913² = 1971532291859138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31396933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15698456 + 15698457.

It is an arithmetic number, because the mean of its divisors is an integer number (15698457).

Almost surely, 2^31396913 is an apocalyptic number.

It is an amenable number.

31396913 is a deficient number, since it is larger than the sum of its proper divisors (1).

31396913 is an equidigital number, since it uses as much as digits as its factorization.

31396913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 35.

The square root of 31396913 is about 5603.2948342917. The cubic root of 31396913 is about 315.4730877359.

The spelling of 31396913 in words is "thirty-one million, three hundred ninety-six thousand, nine hundred thirteen".