91669689 has 6 divisors (see below), whose sum is σ = 132411786. Its totient is φ = 61113120.

The previous prime is 91669681. The next prime is 91669703. The reversal of 91669689 is 98696619.

It can be written as a sum of positive squares in only one way, i.e., 89927289 + 1742400 = 9483^2 + 1320^2 .

It is not a de Polignac number, because 91669689 - 2³ = 91669681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91669681) 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, 5092752 + ... + 5092769.

It is an arithmetic number, because the mean of its divisors is an integer number (22068631).

Almost surely, 2^91669689 is an apocalyptic number.

It is an amenable number.

91669689 is a deficient number, since it is larger than the sum of its proper divisors (40742097).

91669689 is a wasteful number, since it uses less digits than its factorization.

91669689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10185527 (or 10185524 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 91669689 is about 9574.4289124731. The cubic root of 91669689 is about 450.8948268611.

The spelling of 91669689 in words is "ninety-one million, six hundred sixty-nine thousand, six hundred eighty-nine".