91327749 has 4 divisors (see below), whose sum is σ = 121770336. Its totient is φ = 60885164.

The previous prime is 91327741. The next prime is 91327751. The reversal of 91327749 is 94772319.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91327749 - 2³ = 91327741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91327749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91327741) 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, 15221289 + ... + 15221294.

It is an arithmetic number, because the mean of its divisors is an integer number (30442584).

Almost surely, 2^91327749 is an apocalyptic number.

It is an amenable number.

91327749 is a deficient number, since it is larger than the sum of its proper divisors (30442587).

91327749 is a wasteful number, since it uses less digits than its factorization.

91327749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30442586.

The product of its digits is 95256, while the sum is 42.

The square root of 91327749 is about 9556.5552894335. Note that the first 3 decimals coincide. The cubic root of 91327749 is about 450.3334959942. Note that the first 3 decimals are identical.

The spelling of 91327749 in words is "ninety-one million, three hundred twenty-seven thousand, seven hundred forty-nine".