91049859 has 16 divisors (see below), whose sum is σ = 138535840. Its totient is φ = 59058720.

The previous prime is 91049839. The next prime is 91049867. The reversal of 91049859 is 95894019.

It is not a de Polignac number, because 91049859 - 2¹¹ = 91047811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91049839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44572 + ... + 46569.

It is an arithmetic number, because the mean of its divisors is an integer number (8658490).

Almost surely, 2^91049859 is an apocalyptic number.

91049859 is a deficient number, since it is larger than the sum of its proper divisors (47485981).

91049859 is a wasteful number, since it uses less digits than its factorization.

91049859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91187 (or 91181 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 91049859 is about 9542.0049779907. The cubic root of 91049859 is about 449.8762770979.

The spelling of 91049859 in words is "ninety-one million, forty-nine thousand, eight hundred fifty-nine".