91168939 has 4 divisors (see below), whose sum is σ = 91560456. Its totient is φ = 90777424.

The previous prime is 91168927. The next prime is 91168949. The reversal of 91168939 is 93986119.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91168939 - 2⁵ = 91168907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91168949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195409 + ... + 195874.

It is an arithmetic number, because the mean of its divisors is an integer number (22890114).

Almost surely, 2^91168939 is an apocalyptic number.

91168939 is a deficient number, since it is larger than the sum of its proper divisors (391517).

91168939 is a wasteful number, since it uses less digits than its factorization.

91168939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391516.

The product of its digits is 104976, while the sum is 46.

The square root of 91168939 is about 9548.2427179036. The cubic root of 91168939 is about 450.0723159501.

The spelling of 91168939 in words is "ninety-one million, one hundred sixty-eight thousand, nine hundred thirty-nine".