91770689 has 4 divisors (see below), whose sum is σ = 91934256. Its totient is φ = 91607124.

The previous prime is 91770673. The next prime is 91770691. The reversal of 91770689 is 98607719.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91770689 - 2⁴ = 91770673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91770089) 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 3 ways as a sum of consecutive naturals, for example, 80939 + ... + 82064.

It is an arithmetic number, because the mean of its divisors is an integer number (22983564).

Almost surely, 2^91770689 is an apocalyptic number.

It is an amenable number.

91770689 is a deficient number, since it is larger than the sum of its proper divisors (163567).

91770689 is a wasteful number, since it uses less digits than its factorization.

91770689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163566.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 91770689 is about 9579.7019264693. The cubic root of 91770689 is about 451.0603619943.

The spelling of 91770689 in words is "ninety-one million, seven hundred seventy thousand, six hundred eighty-nine".