31200312012 has 48 divisors (see below), whose sum is σ = 77346564960. Its totient is φ = 9770084352.

The previous prime is 31200311981. The next prime is 31200312023. The reversal of 31200312012 is 21021300213.

It is a junction number, because it is equal to n+sod(n) for n = 31200311982 and 31200312000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1198693 + ... + 1224444.

It is an arithmetic number, because the mean of its divisors is an integer number (1611386770).

Almost surely, 2^31200312012 is an apocalyptic number.

It is an amenable number.

31200312012 is an abundant number, since it is smaller than the sum of its proper divisors (46146252948).

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

31200312012 is a wasteful number, since it uses less digits than its factorization.

31200312012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423210 (or 2423208 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31200312012 its reverse (21021300213), we get a palindrome (52221612225).

The spelling of 31200312012 in words is "thirty-one billion, two hundred million, three hundred twelve thousand, twelve".