691914164 has 6 divisors (see below), whose sum is σ = 1210849794. Its totient is φ = 345957080.

The previous prime is 691914151. The next prime is 691914173. The reversal of 691914164 is 461419196.

It can be written as a sum of positive squares in only one way, i.e., 635544100 + 56370064 = 25210^2 + 7508^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86489267 + ... + 86489274.

It is an arithmetic number, because the mean of its divisors is an integer number (201808299).

Almost surely, 2^691914164 is an apocalyptic number.

It is an amenable number.

691914164 is a deficient number, since it is larger than the sum of its proper divisors (518935630).

691914164 is a wasteful number, since it uses less digits than its factorization.

691914164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172978545 (or 172978543 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The square root of 691914164 is about 26304.2613277773. The cubic root of 691914164 is about 884.4719690548.

The spelling of 691914164 in words is "six hundred ninety-one million, nine hundred fourteen thousand, one hundred sixty-four".