31130012 has 6 divisors (see below), whose sum is σ = 54477528. Its totient is φ = 15565004.

The previous prime is 31129991. The next prime is 31130039. The reversal of 31130012 is 21003113.

It is a junction number, because it is equal to n+sod(n) for n = 31129975 and 31130002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3891248 + ... + 3891255.

It is an arithmetic number, because the mean of its divisors is an integer number (9079588).

Almost surely, 2^31130012 is an apocalyptic number.

It is an amenable number.

31130012 is a deficient number, since it is larger than the sum of its proper divisors (23347516).

31130012 is a wasteful number, since it uses less digits than its factorization.

31130012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7782507 (or 7782505 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 31130012 is about 5579.4275692046. The cubic root of 31130012 is about 314.5766109913.

Adding to 31130012 its reverse (21003113), we get a palindrome (52133125).

The spelling of 31130012 in words is "thirty-one million, one hundred thirty thousand, twelve".