31200111312 has 40 divisors (see below), whose sum is σ = 82474718304. Its totient is φ = 10158175104.

The previous prime is 31200111311. The next prime is 31200111323. The reversal of 31200111312 is 21311100213.

It is a happy number.

It is a super-2 number, since 2×31200111312² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31200111291 and 31200111300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31200111311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7556103 + ... + 7560230.

Almost surely, 2^31200111312 is an apocalyptic number.

It is an amenable number.

31200111312 is an abundant number, since it is smaller than the sum of its proper divisors (51274606992).

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

31200111312 is a wasteful number, since it uses less digits than its factorization.

31200111312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15116387 (or 15116381 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31200111312 its reverse (21311100213), we get a palindrome (52511211525).

The spelling of 31200111312 in words is "thirty-one billion, two hundred million, one hundred eleven thousand, three hundred twelve".