91999022 has 8 divisors (see below), whose sum is σ = 140934816. Its totient is φ = 45020752.

The previous prime is 91999021. The next prime is 91999027. The reversal of 91999022 is 22099919.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91999021) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 489263 + ... + 489450.

It is an arithmetic number, because the mean of its divisors is an integer number (17616852).

Almost surely, 2^91999022 is an apocalyptic number.

91999022 is a deficient number, since it is larger than the sum of its proper divisors (48935794).

91999022 is a wasteful number, since it uses less digits than its factorization.

91999022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978762.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 91999022 is about 9591.6120647157. The cubic root of 91999022 is about 451.4341438890.

The spelling of 91999022 in words is "ninety-one million, nine hundred ninety-nine thousand, twenty-two".