91989319 has 8 divisors (see below), whose sum is σ = 93715920. Its totient is φ = 90268416.

The previous prime is 91989311. The next prime is 91989343. The reversal of 91989319 is 91398919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91989319 - 2³ = 91989311 is a prime.

It is a super-2 number, since 2×91989319² = 16924069620167522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91989311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44599 + ... + 46615.

It is an arithmetic number, because the mean of its divisors is an integer number (11714490).

Almost surely, 2^91989319 is an apocalyptic number.

91989319 is a deficient number, since it is larger than the sum of its proper divisors (1726601).

91989319 is a wasteful number, since it uses less digits than its factorization.

91989319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2849.

The product of its digits is 157464, while the sum is 49.

The square root of 91989319 is about 9591.1062448500. The cubic root of 91989319 is about 451.4182726351.

The spelling of 91989319 in words is "ninety-one million, nine hundred eighty-nine thousand, three hundred nineteen".