31974913 has 2 divisors, whose sum is σ = 31974914. Its totient is φ = 31974912.

The previous prime is 31974911. The next prime is 31974947. The reversal of 31974913 is 31947913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22439169 + 9535744 = 4737^2 + 3088^2 .

It is a cyclic number.

It is not a de Polignac number, because 31974913 - 2¹ = 31974911 is a prime.

It is a super-2 number, since 2×31974913² = 2044790122715138, which contains 22 as substring.

Together with 31974911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31974911) 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, 15987456 + 15987457.

It is an arithmetic number, because the mean of its divisors is an integer number (15987457).

Almost surely, 2^31974913 is an apocalyptic number.

It is an amenable number.

31974913 is a deficient number, since it is larger than the sum of its proper divisors (1).

31974913 is an equidigital number, since it uses as much as digits as its factorization.

31974913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 37.

The square root of 31974913 is about 5654.6364162517. The cubic root of 31974913 is about 317.3972238490.

Subtracting from 31974913 its reverse (31947913), we obtain a cube (27000 = 30³).

The spelling of 31974913 in words is "thirty-one million, nine hundred seventy-four thousand, nine hundred thirteen".