685473937 has 2 divisors, whose sum is σ = 685473938. Its totient is φ = 685473936.

The previous prime is 685473931. The next prime is 685473941. The reversal of 685473937 is 739374586.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646735761 + 38738176 = 25431^2 + 6224^2 .

It is a cyclic number.

It is not a de Polignac number, because 685473937 - 2⁷ = 685473809 is a prime.

It is not a weakly prime, because it can be changed into another prime (685473931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342736968 + 342736969.

It is an arithmetic number, because the mean of its divisors is an integer number (342736969).

Almost surely, 2^685473937 is an apocalyptic number.

It is an amenable number.

685473937 is a deficient number, since it is larger than the sum of its proper divisors (1).

685473937 is an equidigital number, since it uses as much as digits as its factorization.

685473937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 52.

The square root of 685473937 is about 26181.5571920388. The cubic root of 685473937 is about 881.7192358302.

The spelling of 685473937 in words is "six hundred eighty-five million, four hundred seventy-three thousand, nine hundred thirty-seven".