312646891 has 2 divisors, whose sum is σ = 312646892. Its totient is φ = 312646890.

The previous prime is 312646823. The next prime is 312646897. The reversal of 312646891 is 198646213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 312646891 - 2⁹ = 312646379 is a prime.

It is not a weakly prime, because it can be changed into another prime (312646897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156323445 + 156323446.

It is an arithmetic number, because the mean of its divisors is an integer number (156323446).

Almost surely, 2^312646891 is an apocalyptic number.

312646891 is a deficient number, since it is larger than the sum of its proper divisors (1).

312646891 is an equidigital number, since it uses as much as digits as its factorization.

312646891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 312646891 is about 17681.8237464352. The cubic root of 312646891 is about 678.7107137650.

The spelling of 312646891 in words is "three hundred twelve million, six hundred forty-six thousand, eight hundred ninety-one".