315745891 has 2 divisors, whose sum is σ = 315745892. Its totient is φ = 315745890.

The previous prime is 315745889. The next prime is 315745907. The reversal of 315745891 is 198547513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 315745891 - 2¹ = 315745889 is a prime.

Together with 315745889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (315745841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157872945 + 157872946.

It is an arithmetic number, because the mean of its divisors is an integer number (157872946).

Almost surely, 2^315745891 is an apocalyptic number.

315745891 is a deficient number, since it is larger than the sum of its proper divisors (1).

315745891 is an equidigital number, since it uses as much as digits as its factorization.

315745891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 43.

The square root of 315745891 is about 17769.2400231411. The cubic root of 315745891 is about 680.9458370488.

The spelling of 315745891 in words is "three hundred fifteen million, seven hundred forty-five thousand, eight hundred ninety-one".