91845899 has 4 divisors (see below), whose sum is σ = 93104136. Its totient is φ = 90587664.

The previous prime is 91845881. The next prime is 91845937. The reversal of 91845899 is 99854819.

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 91845899 - 2¹⁶ = 91780363 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 91845899.

It is not an unprimeable number, because it can be changed into a prime (91845869) 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, 629009 + ... + 629154.

It is an arithmetic number, because the mean of its divisors is an integer number (23276034).

Almost surely, 2^91845899 is an apocalyptic number.

91845899 is a deficient number, since it is larger than the sum of its proper divisors (1258237).

91845899 is a wasteful number, since it uses less digits than its factorization.

91845899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258236.

The product of its digits is 933120, while the sum is 53.

The square root of 91845899 is about 9583.6266100052. The cubic root of 91845899 is about 451.1835494265.

The spelling of 91845899 in words is "ninety-one million, eight hundred forty-five thousand, eight hundred ninety-nine".