312161131 has 2 divisors, whose sum is σ = 312161132. Its totient is φ = 312161130.

The previous prime is 312161111. The next prime is 312161147. The reversal of 312161131 is 131161213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312161131 is a prime.

It is a super-2 number, since 2×312161131² = 194889143414398322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 312161099 and 312161108.

It is not a weakly prime, because it can be changed into another prime (312161111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156080565 + 156080566.

It is an arithmetic number, because the mean of its divisors is an integer number (156080566).

Almost surely, 2^312161131 is an apocalyptic number.

312161131 is a deficient number, since it is larger than the sum of its proper divisors (1).

312161131 is an equidigital number, since it uses as much as digits as its factorization.

312161131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 19.

The square root of 312161131 is about 17668.0822671845. The cubic root of 312161131 is about 678.3590269043.

The spelling of 312161131 in words is "three hundred twelve million, one hundred sixty-one thousand, one hundred thirty-one".