312021131 has 2 divisors, whose sum is σ = 312021132. Its totient is φ = 312021130.

The previous prime is 312021091. The next prime is 312021133. The reversal of 312021131 is 131120213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 312021131 - 2⁶ = 312021067 is a prime.

It is a super-2 number, since 2×312021131² = 194714372381038322, which contains 22 as substring.

Together with 312021133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (312021133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156010565 + 156010566.

It is an arithmetic number, because the mean of its divisors is an integer number (156010566).

Almost surely, 2^312021131 is an apocalyptic number.

312021131 is a deficient number, since it is larger than the sum of its proper divisors (1).

312021131 is an equidigital number, since it uses as much as digits as its factorization.

312021131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 312021131 is about 17664.1198761784. The cubic root of 312021131 is about 678.2576001565.

Adding to 312021131 its reverse (131120213), we get a palindrome (443141344).

The spelling of 312021131 in words is "three hundred twelve million, twenty-one thousand, one hundred thirty-one".