31520104 has 32 divisors (see below), whose sum is σ = 73684800. Its totient is φ = 12280320.

The previous prime is 31520089. The next prime is 31520117. The reversal of 31520104 is 40102513.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 24969 + ... + 26200.

It is an arithmetic number, because the mean of its divisors is an integer number (2302650).

Almost surely, 2^31520104 is an apocalyptic number.

It is an amenable number.

31520104 is an abundant number, since it is smaller than the sum of its proper divisors (42164696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31520104 is a wasteful number, since it uses less digits than its factorization.

31520104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51193 (or 51189 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 31520104 is about 5614.2768011561. The cubic root of 31520104 is about 315.8851529454.

Adding to 31520104 its reverse (40102513), we get a palindrome (71622617).

It can be divided in two parts, 31520 and 104, that multiplied together give a triangular number (3278080 = T₂₅₆₀).

The spelling of 31520104 in words is "thirty-one million, five hundred twenty thousand, one hundred four".