2312731881 has 6 divisors (see below), whose sum is σ = 3340612730. Its totient is φ = 1541821248.

The previous prime is 2312731877. The next prime is 2312731913. The reversal of 2312731881 is 1881372132.

It can be written as a sum of positive squares in only one way, i.e., 2071706256 + 241025625 = 45516^2 + 15525^2 .

It is not a de Polignac number, because 2312731881 - 2² = 2312731877 is a prime.

It is a super-2 number, since 2×2312731881² = 10697457506787596322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2312731831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128485096 + ... + 128485113.

Almost surely, 2^2312731881 is an apocalyptic number.

It is an amenable number.

2312731881 is a deficient number, since it is larger than the sum of its proper divisors (1027880849).

2312731881 is a wasteful number, since it uses less digits than its factorization.

2312731881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256970215 (or 256970212 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 2312731881 is about 48090.8710775756. The cubic root of 2312731881 is about 1322.4373167451.

The spelling of 2312731881 in words is "two billion, three hundred twelve million, seven hundred thirty-one thousand, eight hundred eighty-one".