31974013 has 4 divisors (see below), whose sum is σ = 32303740. Its totient is φ = 31644288.

The previous prime is 31974011. The next prime is 31974023. The reversal of 31974013 is 31047913.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21874329 + 10099684 = 4677^2 + 3178^2 .

It is a cyclic number.

It is not a de Polignac number, because 31974013 - 2¹ = 31974011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31974011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164718 + ... + 164911.

It is an arithmetic number, because the mean of its divisors is an integer number (8075935).

Almost surely, 2^31974013 is an apocalyptic number.

It is an amenable number.

31974013 is a deficient number, since it is larger than the sum of its proper divisors (329727).

31974013 is an equidigital number, since it uses as much as digits as its factorization.

31974013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329726.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 31974013 is about 5654.5568349783. The cubic root of 31974013 is about 317.3942458875.

The spelling of 31974013 in words is "thirty-one million, nine hundred seventy-four thousand, thirteen".