315991201 has 2 divisors, whose sum is σ = 315991202. Its totient is φ = 315991200.

The previous prime is 315991187. The next prime is 315991217. The reversal of 315991201 is 102199513.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210395025 + 105596176 = 14505^2 + 10276^2 .

It is a cyclic number.

It is not a de Polignac number, because 315991201 - 2¹¹ = 315989153 is a prime.

It is not a weakly prime, because it can be changed into another prime (315991001) 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, 157995600 + 157995601.

It is an arithmetic number, because the mean of its divisors is an integer number (157995601).

Almost surely, 2^315991201 is an apocalyptic number.

It is an amenable number.

315991201 is a deficient number, since it is larger than the sum of its proper divisors (1).

315991201 is an equidigital number, since it uses as much as digits as its factorization.

315991201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 315991201 is about 17776.1413416973. The cubic root of 315991201 is about 681.1221387173.

The spelling of 315991201 in words is "three hundred fifteen million, nine hundred ninety-one thousand, two hundred one".