685431767 has 2 divisors, whose sum is σ = 685431768. Its totient is φ = 685431766.

The previous prime is 685431743. The next prime is 685431797. The reversal of 685431767 is 767134586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685431767 - 2⁸ = 685431511 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 (685431797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342715883 + 342715884.

It is an arithmetic number, because the mean of its divisors is an integer number (342715884).

Almost surely, 2^685431767 is an apocalyptic number.

685431767 is a deficient number, since it is larger than the sum of its proper divisors (1).

685431767 is an equidigital number, since it uses as much as digits as its factorization.

685431767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 47.

The square root of 685431767 is about 26180.7518417634. The cubic root of 685431767 is about 881.7011544898.

The spelling of 685431767 in words is "six hundred eighty-five million, four hundred thirty-one thousand, seven hundred sixty-seven".