31004137 has 4 divisors (see below), whose sum is σ = 31015296. Its totient is φ = 30992980.

The previous prime is 31004119. The next prime is 31004147. The reversal of 31004137 is 73140013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31004137 - 2¹¹ = 31002089 is a prime.

It is a super-2 number, since 2×31004137² = 1922513022229538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31004147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2268 + ... + 8194.

It is an arithmetic number, because the mean of its divisors is an integer number (7753824).

Almost surely, 2^31004137 is an apocalyptic number.

It is an amenable number.

31004137 is a deficient number, since it is larger than the sum of its proper divisors (11159).

31004137 is an equidigital number, since it uses as much as digits as its factorization.

31004137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11158.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 31004137 is about 5568.1358640033. The cubic root of 31004137 is about 314.1520386947.

It can be divided in two parts, 310041 and 37, that added together give a triangular number (310078 = T₇₈₇).

The spelling of 31004137 in words is "thirty-one million, four thousand, one hundred thirty-seven".