313121311002 has 24 divisors (see below), whose sum is σ = 684653635380. Its totient is φ = 103416212160.

The previous prime is 313121310977. The next prime is 313121311003. The reversal of 313121311002 is 200113121313.

It can be written as a sum of positive squares in 2 ways, for example, as 307981711521 + 5139599481 = 554961^2 + 71691^2 .

It is a super-2 number, since 2×313121311002² (a number of 24 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 (313121311003) 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, 79794499 + ... + 79798422.

Almost surely, 2^313121311002 is an apocalyptic number.

313121311002 is an abundant number, since it is smaller than the sum of its proper divisors (371532324378).

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

313121311002 is a wasteful number, since it uses less digits than its factorization.

313121311002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159593038 (or 159593035 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 313121311002 its reverse (200113121313), we get a palindrome (513234432315).

The spelling of 313121311002 in words is "three hundred thirteen billion, one hundred twenty-one million, three hundred eleven thousand, two".