685397179 has 2 divisors, whose sum is σ = 685397180. Its totient is φ = 685397178.

The previous prime is 685397173. The next prime is 685397191. The reversal of 685397179 is 971793586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685397179 - 2¹⁵ = 685364411 is a prime.

It is not a weakly prime, because it can be changed into another prime (685397173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342698589 + 342698590.

It is an arithmetic number, because the mean of its divisors is an integer number (342698590).

Almost surely, 2^685397179 is an apocalyptic number.

685397179 is a deficient number, since it is larger than the sum of its proper divisors (1).

685397179 is an equidigital number, since it uses as much as digits as its factorization.

685397179 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 55.

The square root of 685397179 is about 26180.0912718042. The cubic root of 685397179 is about 881.6863235497.

The spelling of 685397179 in words is "six hundred eighty-five million, three hundred ninety-seven thousand, one hundred seventy-nine".