31112321312 has 24 divisors (see below), whose sum is σ = 61490734956. Its totient is φ = 15495626752.

The previous prime is 31112321309. The next prime is 31112321323. The reversal of 31112321312 is 21312321113.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28914961936 + 2197359376 = 170044^2 + 46876^2 .

It is a super-2 number, since 2×31112321312² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1883333 + ... + 1899780.

Almost surely, 2^31112321312 is an apocalyptic number.

31112321312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31112321312 is a deficient number, since it is larger than the sum of its proper divisors (30378413644).

31112321312 is a wasteful number, since it uses less digits than its factorization.

31112321312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3783380 (or 3783372 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

Adding to 31112321312 its reverse (21312321113), we get a palindrome (52424642425).

The spelling of 31112321312 in words is "thirty-one billion, one hundred twelve million, three hundred twenty-one thousand, three hundred twelve".