31120011312 has 80 divisors (see below), whose sum is σ = 86604144480. Its totient is φ = 9572438016.

The previous prime is 31120011271. The next prime is 31120011313. The reversal of 31120011312 is 21311002113.

It is a happy number.

It is a super-2 number, since 2×31120011312² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31120011291 and 31120011300.

It is not an unprimeable number, because it can be changed into a prime (31120011313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2900614 + ... + 2911322.

It is an arithmetic number, because the mean of its divisors is an integer number (1082551806).

Almost surely, 2^31120011312 is an apocalyptic number.

It is an amenable number.

31120011312 is an abundant number, since it is smaller than the sum of its proper divisors (55484133168).

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

31120011312 is a wasteful number, since it uses less digits than its factorization.

31120011312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15390 (or 15384 counting only the distinct ones).

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

Adding to 31120011312 its reverse (21311002113), we get a palindrome (52431013425).

The spelling of 31120011312 in words is "thirty-one billion, one hundred twenty million, eleven thousand, three hundred twelve".