91399259 has 24 divisors (see below), whose sum is σ = 113689008. Its totient is φ = 73006080.

The previous prime is 91399249. The next prime is 91399279. The reversal of 91399259 is 95299319.

It is not a de Polignac number, because 91399259 - 2²⁴ = 74622043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91399219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93644 + ... + 94614.

It is an arithmetic number, because the mean of its divisors is an integer number (4737042).

Almost surely, 2^91399259 is an apocalyptic number.

91399259 is a deficient number, since it is larger than the sum of its proper divisors (22289749).

91399259 is a wasteful number, since it uses less digits than its factorization.

91399259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115 (or 1108 counting only the distinct ones).

The product of its digits is 196830, while the sum is 47.

The square root of 91399259 is about 9560.2959682219. The cubic root of 91399259 is about 450.4510029848.

The spelling of 91399259 in words is "ninety-one million, three hundred ninety-nine thousand, two hundred fifty-nine".