685389037 has 2 divisors, whose sum is σ = 685389038. Its totient is φ = 685389036.

The previous prime is 685389011. The next prime is 685389053. The reversal of 685389037 is 730983586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 542610436 + 142778601 = 23294^2 + 11949^2 .

It is a cyclic number.

It is not a de Polignac number, because 685389037 - 2⁷ = 685388909 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 (685389007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342694518 + 342694519.

It is an arithmetic number, because the mean of its divisors is an integer number (342694519).

Almost surely, 2^685389037 is an apocalyptic number.

It is an amenable number.

685389037 is a deficient number, since it is larger than the sum of its proper divisors (1).

685389037 is an equidigital number, since it uses as much as digits as its factorization.

685389037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 685389037 is about 26179.9357715026. The cubic root of 685389037 is about 881.6828322803.

The spelling of 685389037 in words is "six hundred eighty-five million, three hundred eighty-nine thousand, thirty-seven".