91024979 has 4 divisors (see below), whose sum is σ = 91204320. Its totient is φ = 90845640.

The previous prime is 91024963. The next prime is 91025059. The reversal of 91024979 is 97942019.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91024979 - 2⁴ = 91024963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91024909) 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, 88907 + ... + 89924.

It is an arithmetic number, because the mean of its divisors is an integer number (22801080).

Almost surely, 2^91024979 is an apocalyptic number.

91024979 is a deficient number, since it is larger than the sum of its proper divisors (179341).

91024979 is a wasteful number, since it uses less digits than its factorization.

91024979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179340.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 91024979 is about 9540.7011796828. The cubic root of 91024979 is about 449.8352961029.

The spelling of 91024979 in words is "ninety-one million, twenty-four thousand, nine hundred seventy-nine".