2031312817 has 2 divisors, whose sum is σ = 2031312818. Its totient is φ = 2031312816.

The previous prime is 2031312809. The next prime is 2031312823. The reversal of 2031312817 is 7182131302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1634665761 + 396647056 = 40431^2 + 19916^2 .

It is a cyclic number.

It is not a de Polignac number, because 2031312817 - 2³ = 2031312809 is a prime.

It is not a weakly prime, because it can be changed into another prime (2035312817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1015656408 + 1015656409.

It is an arithmetic number, because the mean of its divisors is an integer number (1015656409).

Almost surely, 2^2031312817 is an apocalyptic number.

It is an amenable number.

2031312817 is a deficient number, since it is larger than the sum of its proper divisors (1).

2031312817 is an equidigital number, since it uses as much as digits as its factorization.

2031312817 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 square root of 2031312817 is about 45070.0878299566. The cubic root of 2031312817 is about 1266.4623097451.

The spelling of 2031312817 in words is "two billion, thirty-one million, three hundred twelve thousand, eight hundred seventeen".