91651689 has 16 divisors (see below), whose sum is σ = 136477440. Its totient is φ = 60787440.

The previous prime is 91651673. The next prime is 91651691. The reversal of 91651689 is 98615619.

It is not a de Polignac number, because 91651689 - 2⁴ = 91651673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91651489) 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 15 ways as a sum of consecutive naturals, for example, 3297 + ... + 13934.

It is an arithmetic number, because the mean of its divisors is an integer number (8529840).

Almost surely, 2^91651689 is an apocalyptic number.

It is an amenable number.

91651689 is a deficient number, since it is larger than the sum of its proper divisors (44825751).

91651689 is a wasteful number, since it uses less digits than its factorization.

91651689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17437 (or 17431 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 91651689 is about 9573.4888624785. The cubic root of 91651689 is about 450.8653127863.

The spelling of 91651689 in words is "ninety-one million, six hundred fifty-one thousand, six hundred eighty-nine".