31504113 has 32 divisors (see below), whose sum is σ = 48384000. Its totient is φ = 20246400.

The previous prime is 31504103. The next prime is 31504127. The reversal of 31504113 is 31140513.

It is not a de Polignac number, because 31504113 - 2⁴ = 31504097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31504103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164848 + ... + 165038.

It is an arithmetic number, because the mean of its divisors is an integer number (1512000).

Almost surely, 2^31504113 is an apocalyptic number.

It is an amenable number.

31504113 is a deficient number, since it is larger than the sum of its proper divisors (16879887).

31504113 is a wasteful number, since it uses less digits than its factorization.

31504113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 31504113 is about 5612.8524833635. The cubic root of 31504113 is about 315.8317248862.

Adding to 31504113 its reverse (31140513), we get a palindrome (62644626).

The spelling of 31504113 in words is "thirty-one million, five hundred four thousand, one hundred thirteen".