685457231 has 2 divisors, whose sum is σ = 685457232. Its totient is φ = 685457230.

The previous prime is 685457203. The next prime is 685457237. The reversal of 685457231 is 132754586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685457231 - 2¹⁸ = 685195087 is a prime.

It is a super-2 number, since 2×685457231² = 939703231060374722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685457237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342728615 + 342728616.

It is an arithmetic number, because the mean of its divisors is an integer number (342728616).

Almost surely, 2^685457231 is an apocalyptic number.

685457231 is a deficient number, since it is larger than the sum of its proper divisors (1).

685457231 is an equidigital number, since it uses as much as digits as its factorization.

685457231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 41.

The square root of 685457231 is about 26181.2381487202. The cubic root of 685457231 is about 881.7120728439.

The spelling of 685457231 in words is "six hundred eighty-five million, four hundred fifty-seven thousand, two hundred thirty-one".