91299999 has 8 divisors (see below), whose sum is σ = 139123840. Its totient is φ = 52171416.

The previous prime is 91299983. The next prime is 91300003. The reversal of 91299999 is 99999219.

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

It is not a de Polignac number, because 91299999 - 2⁴ = 91299983 is a prime.

It is a Duffinian number.

91299999 is a modest number, since divided by 9999 gives 9129 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91299799) 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 7 ways as a sum of consecutive naturals, for example, 2173789 + ... + 2173830.

It is an arithmetic number, because the mean of its divisors is an integer number (17390480).

Almost surely, 2^91299999 is an apocalyptic number.

91299999 is a deficient number, since it is larger than the sum of its proper divisors (47823841).

91299999 is a wasteful number, since it uses less digits than its factorization.

91299999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4347629.

The product of its digits is 1062882, while the sum is 57.

The square root of 91299999 is about 9555.1032961449. The cubic root of 91299999 is about 450.2878799918.

The spelling of 91299999 in words is "ninety-one million, two hundred ninety-nine thousand, nine hundred ninety-nine".