2313131281 has 2 divisors, whose sum is σ = 2313131282. Its totient is φ = 2313131280.

The previous prime is 2313131221. The next prime is 2313131287. The reversal of 2313131281 is 1821313132.

It is a happy number.

2313131281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2127054400 + 186076881 = 46120^2 + 13641^2 .

It is a cyclic number.

It is not a de Polignac number, because 2313131281 - 2²¹ = 2311034129 is a prime.

It is a super-2 number, since 2×2313131281² = 10701152646281401922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2313131287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1156565640 + 1156565641.

It is an arithmetic number, because the mean of its divisors is an integer number (1156565641).

Almost surely, 2^2313131281 is an apocalyptic number.

It is an amenable number.

2313131281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2313131281 is an equidigital number, since it uses as much as digits as its factorization.

2313131281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 2313131281 is about 48095.0234535757. The cubic root of 2313131281 is about 1322.5134389949.

The spelling of 2313131281 in words is "two billion, three hundred thirteen million, one hundred thirty-one thousand, two hundred eighty-one".