31031004 has 24 divisors (see below), whose sum is σ = 72607360. Its totient is φ = 10314864.

The previous prime is 31031003. The next prime is 31031017. The reversal of 31031004 is 40013013.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1137 + ... + 7959.

Almost surely, 2^31031004 is an apocalyptic number.

It is an amenable number.

31031004 is an abundant number, since it is smaller than the sum of its proper divisors (41576356).

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

31031004 is a wasteful number, since it uses less digits than its factorization.

31031004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7209 (or 7207 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 31031004 is about 5570.5479084198. The cubic root of 31031004 is about 314.2427565450.

Adding to 31031004 its reverse (40013013), we get a palindrome (71044017).

Subtracting 31031004 from its reverse (40013013), we obtain a square (8982009 = 2997²).

The spelling of 31031004 in words is "thirty-one million, thirty-one thousand, four".