91667409 has 8 divisors (see below), whose sum is σ = 122290080. Its totient is φ = 61078176.

The previous prime is 91667377. The next prime is 91667453. The reversal of 91667409 is 90476619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91667409 - 2⁵ = 91667377 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (91667809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1047 + ... + 13580.

It is an arithmetic number, because the mean of its divisors is an integer number (15286260).

Almost surely, 2^91667409 is an apocalyptic number.

It is an amenable number.

91667409 is a deficient number, since it is larger than the sum of its proper divisors (30622671).

91667409 is a wasteful number, since it uses less digits than its factorization.

91667409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16719.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 91667409 is about 9574.3098445789. The cubic root of 91667409 is about 450.8910886253.

The spelling of 91667409 in words is "ninety-one million, six hundred sixty-seven thousand, four hundred nine".