685735231 has 2 divisors, whose sum is σ = 685735232. Its totient is φ = 685735230.

The previous prime is 685735201. The next prime is 685735249. The reversal of 685735231 is 132537586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685735231 - 2¹⁷ = 685604159 is a prime.

It is a super-2 number, since 2×685735231² = 940465614069246722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685735201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342867615 + 342867616.

It is an arithmetic number, because the mean of its divisors is an integer number (342867616).

Almost surely, 2^685735231 is an apocalyptic number.

685735231 is a deficient number, since it is larger than the sum of its proper divisors (1).

685735231 is an equidigital number, since it uses as much as digits as its factorization.

685735231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 40.

The square root of 685735231 is about 26186.5467559203. The cubic root of 685735231 is about 881.8312550070.

The spelling of 685735231 in words is "six hundred eighty-five million, seven hundred thirty-five thousand, two hundred thirty-one".