685938413 has 2 divisors, whose sum is σ = 685938414. Its totient is φ = 685938412.

The previous prime is 685938377. The next prime is 685938419. The reversal of 685938413 is 314839586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531855844 + 154082569 = 23062^2 + 12413^2 .

It is a cyclic number.

It is not a de Polignac number, because 685938413 - 2¹⁰ = 685937389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685938419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342969206 + 342969207.

It is an arithmetic number, because the mean of its divisors is an integer number (342969207).

Almost surely, 2^685938413 is an apocalyptic number.

It is an amenable number.

685938413 is a deficient number, since it is larger than the sum of its proper divisors (1).

685938413 is an equidigital number, since it uses as much as digits as its factorization.

685938413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 47.

The square root of 685938413 is about 26190.4259797354. The cubic root of 685938413 is about 881.9183413618.

The spelling of 685938413 in words is "six hundred eighty-five million, nine hundred thirty-eight thousand, four hundred thirteen".