691541896 has 16 divisors (see below), whose sum is σ = 1304138700. Its totient is φ = 343771584.

The previous prime is 691541881. The next prime is 691541909. The reversal of 691541896 is 698145196.

It can be written as a sum of positive squares in 2 ways, for example, as 687173796 + 4368100 = 26214^2 + 2090^2 .

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, 248451 + ... + 251218.

Almost surely, 2^691541896 is an apocalyptic number.

It is an amenable number.

691541896 is a deficient number, since it is larger than the sum of its proper divisors (612596804).

691541896 is a wasteful number, since it uses less digits than its factorization.

691541896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499848 (or 499844 counting only the distinct ones).

The product of its digits is 466560, while the sum is 49.

The square root of 691541896 is about 26297.1841838627. The cubic root of 691541896 is about 884.3133175457.

The spelling of 691541896 in words is "six hundred ninety-one million, five hundred forty-one thousand, eight hundred ninety-six".