91889279 has 4 divisors (see below), whose sum is σ = 91953720. Its totient is φ = 91824840.

The previous prime is 91889243. The next prime is 91889293. The reversal of 91889279 is 97298819.

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 91889279 - 2²⁰ = 90840703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91889279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91889219) 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, 30032 + ... + 32949.

It is an arithmetic number, because the mean of its divisors is an integer number (22988430).

Almost surely, 2^91889279 is an apocalyptic number.

91889279 is a deficient number, since it is larger than the sum of its proper divisors (64441).

91889279 is a wasteful number, since it uses less digits than its factorization.

91889279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64440.

The product of its digits is 653184, while the sum is 53.

The square root of 91889279 is about 9585.8895779161. The cubic root of 91889279 is about 451.2545715116.

The spelling of 91889279 in words is "ninety-one million, eight hundred eighty-nine thousand, two hundred seventy-nine".