312427131561 has 20 divisors (see below), whose sum is σ = 466733081232. Its totient is φ = 208275406488.

The previous prime is 312427131559. The next prime is 312427131563. The reversal of 312427131561 is 165131724213.

312427131561 is a `hidden beast` number, since 3 + 1 + 24 + 2 + 71 + 3 + 1 + 561 = 666.

It is an interprime number because it is at equal distance from previous prime (312427131559) and next prime (312427131563).

It is not a de Polignac number, because 312427131561 - 2¹ = 312427131559 is a prime.

It is a super-2 number, since 2×312427131561² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (312427131563) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2054206 + ... + 2201048.

Almost surely, 2^312427131561 is an apocalyptic number.

It is an amenable number.

312427131561 is a deficient number, since it is larger than the sum of its proper divisors (154305949671).

312427131561 is a wasteful number, since it uses less digits than its factorization.

312427131561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173122 (or 173113 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

Adding to 312427131561 its reverse (165131724213), we get a palindrome (477558855774).

The spelling of 312427131561 in words is "three hundred twelve billion, four hundred twenty-seven million, one hundred thirty-one thousand, five hundred sixty-one".