31033131012 has 36 divisors (see below), whose sum is σ = 84479080140. Its totient is φ = 9548655552.

The previous prime is 31033130983. The next prime is 31033131119. The reversal of 31033131012 is 21013133013.

It is a happy number.

31033131012 is a `hidden beast` number, since 3 + 10 + 331 + 310 + 12 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7988069376 + 23045061636 = 89376^2 + 151806^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×31033131012² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33154587 + ... + 33155522.

It is an arithmetic number, because the mean of its divisors is an integer number (2346641115).

Almost surely, 2^31033131012 is an apocalyptic number.

It is an amenable number.

31033131012 is an abundant number, since it is smaller than the sum of its proper divisors (53445949128).

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

31033131012 is a wasteful number, since it uses less digits than its factorization.

31033131012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66310132 (or 66310127 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31033131012 its reverse (21013133013), we get a palindrome (52046264025).

The spelling of 31033131012 in words is "thirty-one billion, thirty-three million, one hundred thirty-one thousand, twelve".