91288577 has 4 divisors (see below), whose sum is σ = 91389696. Its totient is φ = 91187460.

The previous prime is 91288537. The next prime is 91288579. The reversal of 91288577 is 77588219.

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 91288577 - 2²⁰ = 90240001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91288579) 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 3 ways as a sum of consecutive naturals, for example, 49193 + ... + 51014.

It is an arithmetic number, because the mean of its divisors is an integer number (22847424).

Almost surely, 2^91288577 is an apocalyptic number.

It is an amenable number.

91288577 is a deficient number, since it is larger than the sum of its proper divisors (101119).

91288577 is a wasteful number, since it uses less digits than its factorization.

91288577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101118.

The product of its digits is 282240, while the sum is 47.

The square root of 91288577 is about 9554.5055863713. The cubic root of 91288577 is about 450.2691015957.

The spelling of 91288577 in words is "ninety-one million, two hundred eighty-eight thousand, five hundred seventy-seven".