315204043991 has 2 divisors, whose sum is σ = 315204043992. Its totient is φ = 315204043990.

The previous prime is 315204043961. The next prime is 315204044039. The reversal of 315204043991 is 199340402513.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315204043991 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315204043961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157602021995 + 157602021996.

It is an arithmetic number, because the mean of its divisors is an integer number (157602021996).

Almost surely, 2^315204043991 is an apocalyptic number.

315204043991 is a deficient number, since it is larger than the sum of its proper divisors (1).

315204043991 is an equidigital number, since it uses as much as digits as its factorization.

315204043991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 315204043991 in words is "three hundred fifteen billion, two hundred four million, forty-three thousand, nine hundred ninety-one".