31231203013117 has 2 divisors, whose sum is σ = 31231203013118. Its totient is φ = 31231203013116.

The previous prime is 31231203013013. The next prime is 31231203013147. The reversal of 31231203013117 is 71131030213213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15632384195961 + 15598818817156 = 3953781^2 + 3949534^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231203013117 - 2²⁷ = 31231068795389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31231203013147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615601506558 + 15615601506559.

It is an arithmetic number, because the mean of its divisors is an integer number (15615601506559).

Almost surely, 2^{31231203013117} is an apocalyptic number.

It is an amenable number.

31231203013117 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231203013117 is an equidigital number, since it uses as much as digits as its factorization.

31231203013117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

The spelling of 31231203013117 in words is "thirty-one trillion, two hundred thirty-one billion, two hundred three million, thirteen thousand, one hundred seventeen".