31020120313 has 16 divisors (see below), whose sum is σ = 38716344576. Its totient is φ = 24197705280.

The previous prime is 31020120301. The next prime is 31020120319. The reversal of 31020120313 is 31302102013.

It is a de Polignac number, because none of the positive numbers 2^k-31020120313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31020120319) 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, 2394106 + ... + 2407027.

It is an arithmetic number, because the mean of its divisors is an integer number (2419771536).

Almost surely, 2^31020120313 is an apocalyptic number.

It is an amenable number.

31020120313 is a deficient number, since it is larger than the sum of its proper divisors (7696224263).

31020120313 is a wasteful number, since it uses less digits than its factorization.

31020120313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4801224.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31020120313 its reverse (31302102013), we get a palindrome (62322222326).

The spelling of 31020120313 in words is "thirty-one billion, twenty million, one hundred twenty thousand, three hundred thirteen".