691658312 has 16 divisors (see below), whose sum is σ = 1297666860. Its totient is φ = 345613824.

The previous prime is 691658309. The next prime is 691658333. The reversal of 691658312 is 213856196.

691658312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 549714916 + 141943396 = 23446^2 + 11914^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 691658312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12833 + ... + 39344.

Almost surely, 2^691658312 is an apocalyptic number.

It is an amenable number.

691658312 is a deficient number, since it is larger than the sum of its proper divisors (606008548).

691658312 is a wasteful number, since it uses less digits than its factorization.

691658312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53840 (or 53836 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 691658312 is about 26299.3975596400. The cubic root of 691658312 is about 884.3629373125.

It can be divided in two parts, 69165 and 8312, that added together give a palindrome (77477).

The spelling of 691658312 in words is "six hundred ninety-one million, six hundred fifty-eight thousand, three hundred twelve".