312608809 has 2 divisors, whose sum is σ = 312608810. Its totient is φ = 312608808.

The previous prime is 312608783. The next prime is 312608831. The reversal of 312608809 is 908806213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190440000 + 122168809 = 13800^2 + 11053^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312608809 is a prime.

It is not a weakly prime, because it can be changed into another prime (312608899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156304404 + 156304405.

It is an arithmetic number, because the mean of its divisors is an integer number (156304405).

Almost surely, 2^312608809 is an apocalyptic number.

It is an amenable number.

312608809 is a deficient number, since it is larger than the sum of its proper divisors (1).

312608809 is an equidigital number, since it uses as much as digits as its factorization.

312608809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 312608809 is about 17680.7468450855. The cubic root of 312608809 is about 678.6831558270.

The spelling of 312608809 in words is "three hundred twelve million, six hundred eight thousand, eight hundred nine".