691891152 has 40 divisors (see below), whose sum is σ = 1865100864. Its totient is φ = 220602624.

The previous prime is 691891141. The next prime is 691891169. The reversal of 691891152 is 251198196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312253 + ... + 314460.

Almost surely, 2^691891152 is an apocalyptic number.

It is an amenable number.

691891152 is an abundant number, since it is smaller than the sum of its proper divisors (1173209712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691891152 is a wasteful number, since it uses less digits than its factorization.

691891152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626747 (or 626741 counting only the distinct ones).

The product of its digits is 38880, while the sum is 42.

The square root of 691891152 is about 26303.8239045200. The cubic root of 691891152 is about 884.4621635541.

The spelling of 691891152 in words is "six hundred ninety-one million, eight hundred ninety-one thousand, one hundred fifty-two".