313237891 has 2 divisors, whose sum is σ = 313237892. Its totient is φ = 313237890.

The previous prime is 313237861. The next prime is 313237927. The reversal of 313237891 is 198732313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 313237891 - 2⁷ = 313237763 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 313237891.

It is not a weakly prime, because it can be changed into another prime (313237831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156618945 + 156618946.

It is an arithmetic number, because the mean of its divisors is an integer number (156618946).

Almost surely, 2^313237891 is an apocalyptic number.

313237891 is a deficient number, since it is larger than the sum of its proper divisors (1).

313237891 is an equidigital number, since it uses as much as digits as its factorization.

313237891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 313237891 is about 17698.5279331361. The cubic root of 313237891 is about 679.1381027912.

The spelling of 313237891 in words is "three hundred thirteen million, two hundred thirty-seven thousand, eight hundred ninety-one".