31231004 has 24 divisors (see below), whose sum is σ = 62845440. Its totient is φ = 13302576.

The previous prime is 31230977. The next prime is 31231009. The reversal of 31231004 is 40013213.

It is a super-2 number, since 2×31231004² = 1950751221696032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a self number, because there is not a number n which added to its sum of digits gives 31231004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1337 + ... + 8015.

It is an arithmetic number, because the mean of its divisors is an integer number (2618560).

Almost surely, 2^31231004 is an apocalyptic number.

It is an amenable number.

31231004 is an abundant number, since it is smaller than the sum of its proper divisors (31614436).

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

31231004 is a wasteful number, since it uses less digits than its factorization.

31231004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6857 (or 6855 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31231004 is about 5588.4706315771. The cubic root of 31231004 is about 314.9164269767.

Adding to 31231004 its reverse (40013213), we get a palindrome (71244217).

The spelling of 31231004 in words is "thirty-one million, two hundred thirty-one thousand, four".