691830189 has 6 divisors (see below), whose sum is σ = 999310286. Its totient is φ = 461220120.

The previous prime is 691830173. The next prime is 691830199. The reversal of 691830189 is 981038196.

It can be written as a sum of positive squares in only one way, i.e., 663474564 + 28355625 = 25758^2 + 5325^2 .

It is not a de Polignac number, because 691830189 - 2⁴ = 691830173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691830199) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38435002 + ... + 38435019.

Almost surely, 2^691830189 is an apocalyptic number.

It is an amenable number.

691830189 is a deficient number, since it is larger than the sum of its proper divisors (307480097).

691830189 is a wasteful number, since it uses less digits than its factorization.

691830189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76870027 (or 76870024 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 691830189 is about 26302.6650550852. The cubic root of 691830189 is about 884.4361859368.

The spelling of 691830189 in words is "six hundred ninety-one million, eight hundred thirty thousand, one hundred eighty-nine".