91189065 has 32 divisors (see below), whose sum is σ = 159667200. Its totient is φ = 44073920.

The previous prime is 91189057. The next prime is 91189081. The reversal of 91189065 is 56098119.

It is not a de Polignac number, because 91189065 - 2³ = 91189057 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 68476 + ... + 69794.

It is an arithmetic number, because the mean of its divisors is an integer number (4989600).

Almost surely, 2^91189065 is an apocalyptic number.

It is an amenable number.

91189065 is a deficient number, since it is larger than the sum of its proper divisors (68478135).

91189065 is a wasteful number, since it uses less digits than its factorization.

91189065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 91189065 is about 9549.2965709522. The cubic root of 91189065 is about 450.1054320861.

The spelling of 91189065 in words is "ninety-one million, one hundred eighty-nine thousand, sixty-five".