691131304 has 16 divisors (see below), whose sum is σ = 1296162900. Its totient is φ = 345487872.

The previous prime is 691131299. The next prime is 691131307. The reversal of 691131304 is 403131196.

It can be written as a sum of positive squares in 2 ways, for example, as 686335204 + 4796100 = 26198^2 + 2190^2 .

It is not an unprimeable number, because it can be changed into a prime (691131307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48664 + ... + 61240.

Almost surely, 2^691131304 is an apocalyptic number.

It is an amenable number.

691131304 is a deficient number, since it is larger than the sum of its proper divisors (605031596).

691131304 is a wasteful number, since it uses less digits than its factorization.

691131304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19452 (or 19448 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 691131304 is about 26289.3762573402. The cubic root of 691131304 is about 884.1382672417.

The spelling of 691131304 in words is "six hundred ninety-one million, one hundred thirty-one thousand, three hundred four".