315763891 has 2 divisors, whose sum is σ = 315763892. Its totient is φ = 315763890.

The previous prime is 315763873. The next prime is 315763897. The reversal of 315763891 is 198367513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 315763891 - 2⁹ = 315763379 is a prime.

It is not a weakly prime, because it can be changed into another prime (315763897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157881945 + 157881946.

It is an arithmetic number, because the mean of its divisors is an integer number (157881946).

Almost surely, 2^315763891 is an apocalyptic number.

315763891 is a deficient number, since it is larger than the sum of its proper divisors (1).

315763891 is an equidigital number, since it uses as much as digits as its factorization.

315763891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 315763891 is about 17769.7465091655. The cubic root of 315763891 is about 680.9587765597.

It can be divided in two parts, 3157638 and 91, that added together give a square (3157729 = 1777²).

The spelling of 315763891 in words is "three hundred fifteen million, seven hundred sixty-three thousand, eight hundred ninety-one".