699685309 has 4 divisors (see below), whose sum is σ = 699769980. Its totient is φ = 699600640.

The previous prime is 699685289. The next prime is 699685373. The reversal of 699685309 is 903586996.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 402122809 + 297562500 = 20053^2 + 17250^2 .

It is a cyclic number.

It is not a de Polignac number, because 699685309 - 2²³ = 691296701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 699685309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (699685009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28414 + ... + 46975.

It is an arithmetic number, because the mean of its divisors is an integer number (174942495).

Almost surely, 2^699685309 is an apocalyptic number.

It is an amenable number.

699685309 is a deficient number, since it is larger than the sum of its proper divisors (84671).

699685309 is an equidigital number, since it uses as much as digits as its factorization.

699685309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84670.

The product of its (nonzero) digits is 3149280, while the sum is 55.

The square root of 699685309 is about 26451.5653412043. The cubic root of 699685309 is about 887.7709268474.

The spelling of 699685309 in words is "six hundred ninety-nine million, six hundred eighty-five thousand, three hundred nine".