685092761 has 2 divisors, whose sum is σ = 685092762. Its totient is φ = 685092760.

The previous prime is 685092757. The next prime is 685092763. The reversal of 685092761 is 167290586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 597558025 + 87534736 = 24445^2 + 9356^2 .

It is a cyclic number.

It is not a de Polignac number, because 685092761 - 2² = 685092757 is a prime.

Together with 685092763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (685092763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342546380 + 342546381.

It is an arithmetic number, because the mean of its divisors is an integer number (342546381).

Almost surely, 2^685092761 is an apocalyptic number.

It is an amenable number.

685092761 is a deficient number, since it is larger than the sum of its proper divisors (1).

685092761 is an equidigital number, since it uses as much as digits as its factorization.

685092761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 685092761 is about 26174.2767044287. The cubic root of 685092761 is about 881.5557710555. Note that the first 3 decimals are identical.

The spelling of 685092761 in words is "six hundred eighty-five million, ninety-two thousand, seven hundred sixty-one".