31312321002 has 24 divisors (see below), whose sum is σ = 69676968036. Its totient is φ = 10155347136.

The previous prime is 31312320979. The next prime is 31312321009. The reversal of 31312321002 is 20012321313.

31312321002 is a `hidden beast` number, since 31 + 312 + 321 + 0 + 0 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 29162051361 + 2150269641 = 170769^2 + 46371^2 .

It is a super-2 number, since 2×31312321002² (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 not an unprimeable number, because it can be changed into a prime (31312321009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23507083 + ... + 23508414.

Almost surely, 2^31312321002 is an apocalyptic number.

31312321002 is an abundant number, since it is smaller than the sum of its proper divisors (38364647034).

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

31312321002 is a wasteful number, since it uses less digits than its factorization.

31312321002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47015542 (or 47015539 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31312321002 its reverse (20012321313), we get a palindrome (51324642315).

The spelling of 31312321002 in words is "thirty-one billion, three hundred twelve million, three hundred twenty-one thousand, two".