691164 has 36 divisors (see below), whose sum is σ = 1777776. Its totient is φ = 226368.

The previous prime is 691153. The next prime is 691181. The reversal of 691164 is 461196.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2497 + ... + 2759.

2⁶⁹¹¹⁶⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (888888).

691164 is an abundant number, since it is smaller than the sum of its proper divisors (1086612).

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

691164 is a wasteful number, since it uses less digits than its factorization.

691164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 341 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 691164 is about 831.3627367160. The cubic root of 691164 is about 88.4152209276.

The spelling of 691164 in words is "six hundred ninety-one thousand, one hundred sixty-four".