685129513 has 2 divisors, whose sum is σ = 685129514. Its totient is φ = 685129512.

The previous prime is 685129483. The next prime is 685129517. The reversal of 685129513 is 315921586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 651117289 + 34012224 = 25517^2 + 5832^2 .

It is a cyclic number.

It is not a de Polignac number, because 685129513 - 2²⁹ = 148258601 is a prime.

It is not a weakly prime, because it can be changed into another prime (685129517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342564756 + 342564757.

It is an arithmetic number, because the mean of its divisors is an integer number (342564757).

Almost surely, 2^685129513 is an apocalyptic number.

It is an amenable number.

685129513 is a deficient number, since it is larger than the sum of its proper divisors (1).

685129513 is an equidigital number, since it uses as much as digits as its factorization.

685129513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 40.

The square root of 685129513 is about 26174.9787583486. The cubic root of 685129513 is about 881.5715345454.

The spelling of 685129513 in words is "six hundred eighty-five million, one hundred twenty-nine thousand, five hundred thirteen".