312081131 has 2 divisors, whose sum is σ = 312081132. Its totient is φ = 312081130.

The previous prime is 312081127. The next prime is 312081163. The reversal of 312081131 is 131180213.

It is a weak prime.

It is an emirp because it is prime and its reverse (131180213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312081131 - 2² = 312081127 is a prime.

It is a super-2 number, since 2×312081131² = 194789264652478322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312083131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156040565 + 156040566.

It is an arithmetic number, because the mean of its divisors is an integer number (156040566).

Almost surely, 2^312081131 is an apocalyptic number.

312081131 is a deficient number, since it is larger than the sum of its proper divisors (1).

312081131 is an equidigital number, since it uses as much as digits as its factorization.

312081131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 312081131 is about 17665.8181525793. The cubic root of 312081131 is about 678.3010724770.

The spelling of 312081131 in words is "three hundred twelve million, eighty-one thousand, one hundred thirty-one".