91755399 has 4 divisors (see below), whose sum is σ = 122340536. Its totient is φ = 61170264.

The previous prime is 91755383. The next prime is 91755401. The reversal of 91755399 is 99355719.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99355719 = 3 ⋅33118573.

It is not a de Polignac number, because 91755399 - 2⁴ = 91755383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91753399) 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 3 ways as a sum of consecutive naturals, for example, 15292564 + ... + 15292569.

It is an arithmetic number, because the mean of its divisors is an integer number (30585134).

Almost surely, 2^91755399 is an apocalyptic number.

91755399 is a deficient number, since it is larger than the sum of its proper divisors (30585137).

91755399 is a wasteful number, since it uses less digits than its factorization.

91755399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30585136.

The product of its digits is 382725, while the sum is 48.

The square root of 91755399 is about 9578.9038516941. The cubic root of 91755399 is about 451.0353100739.

The spelling of 91755399 in words is "ninety-one million, seven hundred fifty-five thousand, three hundred ninety-nine".