91040022 has 24 divisors (see below), whose sum is σ = 198764280. Its totient is φ = 30114240.

The previous prime is 91039997. The next prime is 91040023. The reversal of 91040022 is 22004019.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 91039977 and 91040004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91040023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16947 + ... + 21662.

It is an arithmetic number, because the mean of its divisors is an integer number (8281845).

Almost surely, 2^91040022 is an apocalyptic number.

91040022 is an abundant number, since it is smaller than the sum of its proper divisors (107724258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91040022 is a wasteful number, since it uses less digits than its factorization.

91040022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38748 (or 38745 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 91040022 is about 9541.4895063612. The cubic root of 91040022 is about 449.8600750141.

The spelling of 91040022 in words is "ninety-one million, forty thousand, twenty-two".