691139100 has 36 divisors (see below), whose sum is σ = 1999696664. Its totient is φ = 184303680.

The previous prime is 691139087. The next prime is 691139123. The reversal of 691139100 is 1931196.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1151599 + ... + 1152198.

Almost surely, 2^691139100 is an apocalyptic number.

691139100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691139100 is an abundant number, since it is smaller than the sum of its proper divisors (1308557564).

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

691139100 is a wasteful number, since it uses less digits than its factorization.

691139100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303814 (or 2303807 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 691139100 is about 26289.5245297438. The cubic root of 691139100 is about 884.1415916057.

The spelling of 691139100 in words is "six hundred ninety-one million, one hundred thirty-nine thousand, one hundred".