91669825 has 24 divisors (see below), whose sum is σ = 123212600. Its totient is φ = 67654080.

The previous prime is 91669819. The next prime is 91669829. The reversal of 91669825 is 52896619.

It can be written as a sum of positive squares in 12 ways, for example, as 91164304 + 505521 = 9548^2 + 711^2 .

It is not a de Polignac number, because 91669825 - 2³ = 91669817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91669829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54091 + ... + 55759.

Almost surely, 2^91669825 is an apocalyptic number.

It is an amenable number.

91669825 is a deficient number, since it is larger than the sum of its proper divisors (31542775).

91669825 is a wasteful number, since it uses less digits than its factorization.

91669825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718 (or 1687 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 91669825 is about 9574.4360147217. The cubic root of 91669825 is about 450.8950498416.

The spelling of 91669825 in words is "ninety-one million, six hundred sixty-nine thousand, eight hundred twenty-five".