315812909 has 2 divisors, whose sum is σ = 315812910. Its totient is φ = 315812908.

The previous prime is 315812863. The next prime is 315812923. The reversal of 315812909 is 909218513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168870025 + 146942884 = 12995^2 + 12122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315812909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315812999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157906454 + 157906455.

It is an arithmetic number, because the mean of its divisors is an integer number (157906455).

Almost surely, 2^315812909 is an apocalyptic number.

It is an amenable number.

315812909 is a deficient number, since it is larger than the sum of its proper divisors (1).

315812909 is an equidigital number, since it uses as much as digits as its factorization.

315812909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 315812909 is about 17771.1257099825. The cubic root of 315812909 is about 680.9940112304.

The spelling of 315812909 in words is "three hundred fifteen million, eight hundred twelve thousand, nine hundred nine".