91606689 has 12 divisors (see below), whose sum is σ = 134490772. Its totient is φ = 60069600.

The previous prime is 91606673. The next prime is 91606729. The reversal of 91606689 is 98660619.

It can be written as a sum of positive squares in 2 ways, for example, as 43996689 + 47610000 = 6633^2 + 6900^2 .

It is not a de Polignac number, because 91606689 - 2⁴ = 91606673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91606609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82882 + ... + 83979.

Almost surely, 2^91606689 is an apocalyptic number.

It is an amenable number.

91606689 is a deficient number, since it is larger than the sum of its proper divisors (42884083).

91606689 is a wasteful number, since it uses less digits than its factorization.

91606689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166928 (or 166925 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 91606689 is about 9571.1383335526. The cubic root of 91606689 is about 450.7915106893.

The spelling of 91606689 in words is "ninety-one million, six hundred six thousand, six hundred eighty-nine".