91679889 has 16 divisors (see below), whose sum is σ = 141994880. Its totient is φ = 51528960.

The previous prime is 91679881. The next prime is 91679893. The reversal of 91679889 is 98897619.

It is not a de Polignac number, because 91679889 - 2³ = 91679881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91679881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34504 + ... + 37065.

It is an arithmetic number, because the mean of its divisors is an integer number (8874680).

Almost surely, 2^91679889 is an apocalyptic number.

It is an amenable number.

91679889 is a deficient number, since it is larger than the sum of its proper divisors (50314991).

91679889 is a wasteful number, since it uses less digits than its factorization.

91679889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71640.

The product of its digits is 1959552, while the sum is 57.

The square root of 91679889 is about 9574.9615665025. The cubic root of 91679889 is about 450.9115497885.

The spelling of 91679889 in words is "ninety-one million, six hundred seventy-nine thousand, eight hundred eighty-nine".