31004136 has 48 divisors (see below), whose sum is σ = 84389760. Its totient is φ = 10283040.

The previous prime is 31004119. The next prime is 31004147. The reversal of 31004136 is 63140013.

It is a super-2 number, since 2×31004136² = 1922512898212992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 15091 + ... + 17021.

It is an arithmetic number, because the mean of its divisors is an integer number (1758120).

Almost surely, 2^31004136 is an apocalyptic number.

31004136 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31004136 is an abundant number, since it is smaller than the sum of its proper divisors (53385624).

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

31004136 is a wasteful number, since it uses less digits than its factorization.

31004136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166 (or 2159 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 31004136 is about 5568.1357742067. The cubic root of 31004136 is about 314.1520353172.

Adding to 31004136 its reverse (63140013), we get a palindrome (94144149).

The spelling of 31004136 in words is "thirty-one million, four thousand, one hundred thirty-six".