31323121313 has 8 divisors (see below), whose sum is σ = 34179597216. Its totient is φ = 28468132000.

The previous prime is 31323121309. The next prime is 31323121381. The reversal of 31323121313 is 31312132313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31323121313 - 2² = 31323121309 is a prime.

It is a super-2 number, since 2×31323121313² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31323121303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327356 + ... + 412077.

It is an arithmetic number, because the mean of its divisors is an integer number (4272449652).

Almost surely, 2^31323121313 is an apocalyptic number.

It is an amenable number.

31323121313 is a deficient number, since it is larger than the sum of its proper divisors (2856475903).

31323121313 is a wasteful number, since it uses less digits than its factorization.

31323121313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743295.

The product of its digits is 972, while the sum is 23.

Adding to 31323121313 its reverse (31312132313), we get a palindrome (62635253626).

The spelling of 31323121313 in words is "thirty-one billion, three hundred twenty-three million, one hundred twenty-one thousand, three hundred thirteen".