91243299 has 16 divisors (see below), whose sum is σ = 140417280. Its totient is φ = 51621600.

The previous prime is 91243283. The next prime is 91243343. The reversal of 91243299 is 99234219.

It is not a de Polignac number, because 91243299 - 2⁴ = 91243283 is a prime.

It is a super-2 number, since 2×91243299² = 16650679224806802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91243099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19389 + ... + 23630.

It is an arithmetic number, because the mean of its divisors is an integer number (8776080).

Almost surely, 2^91243299 is an apocalyptic number.

91243299 is a deficient number, since it is larger than the sum of its proper divisors (49173981).

91243299 is a wasteful number, since it uses less digits than its factorization.

91243299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43130.

The product of its digits is 34992, while the sum is 39.

The square root of 91243299 is about 9552.1358344613. The cubic root of 91243299 is about 450.1946466580.

The spelling of 91243299 in words is "ninety-one million, two hundred forty-three thousand, two hundred ninety-nine".