31201213120997 has 2 divisors, whose sum is σ = 31201213120998. Its totient is φ = 31201213120996.

The previous prime is 31201213120939. The next prime is 31201213121033. The reversal of 31201213120997 is 79902131210213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22470169153441 + 8731043967556 = 4740271^2 + 2954834^2 .

It is a cyclic number.

It is not a de Polignac number, because 31201213120997 - 2⁸ = 31201213120741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31201213120697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600606560498 + 15600606560499.

It is an arithmetic number, because the mean of its divisors is an integer number (15600606560499).

Almost surely, 2^{31201213120997} is an apocalyptic number.

It is an amenable number.

31201213120997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31201213120997 is an equidigital number, since it uses as much as digits as its factorization.

31201213120997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 41.

The spelling of 31201213120997 in words is "thirty-one trillion, two hundred one billion, two hundred thirteen million, one hundred twenty thousand, nine hundred ninety-seven".