91423159 has 4 divisors (see below), whose sum is σ = 91445920. Its totient is φ = 91400400.

The previous prime is 91423151. The next prime is 91423177. The reversal of 91423159 is 95132419.

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 91423159 - 2³ = 91423151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91423151) 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, 3567 + ... + 13984.

It is an arithmetic number, because the mean of its divisors is an integer number (22861480).

Almost surely, 2^91423159 is an apocalyptic number.

91423159 is a deficient number, since it is larger than the sum of its proper divisors (22761).

91423159 is a wasteful number, since it uses less digits than its factorization.

91423159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22760.

The product of its digits is 9720, while the sum is 34.

The square root of 91423159 is about 9561.5458478219. The cubic root of 91423159 is about 450.4902623867.

The spelling of 91423159 in words is "ninety-one million, four hundred twenty-three thousand, one hundred fifty-nine".