31207820113 has 2 divisors, whose sum is σ = 31207820114. Its totient is φ = 31207820112.

The previous prime is 31207820009. The next prime is 31207820123. The reversal of 31207820113 is 31102870213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30158837569 + 1048982544 = 173663^2 + 32388^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31207820113 is a prime.

It is not a weakly prime, because it can be changed into another prime (31207820123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15603910056 + 15603910057.

It is an arithmetic number, because the mean of its divisors is an integer number (15603910057).

Almost surely, 2^31207820113 is an apocalyptic number.

It is an amenable number.

31207820113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31207820113 is an equidigital number, since it uses as much as digits as its factorization.

31207820113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The spelling of 31207820113 in words is "thirty-one billion, two hundred seven million, eight hundred twenty thousand, one hundred thirteen".