91293491 has 4 divisors (see below), whose sum is σ = 92101512. Its totient is φ = 90485472.

The previous prime is 91293487. The next prime is 91293493. The reversal of 91293491 is 19439219.

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 91293491 - 2² = 91293487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91293493) 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, 403841 + ... + 404066.

It is an arithmetic number, because the mean of its divisors is an integer number (23025378).

Almost surely, 2^91293491 is an apocalyptic number.

91293491 is a deficient number, since it is larger than the sum of its proper divisors (808021).

91293491 is a wasteful number, since it uses less digits than its factorization.

91293491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808020.

The product of its digits is 17496, while the sum is 38.

The square root of 91293491 is about 9554.7627390742. The cubic root of 91293491 is about 450.2771806739.

The spelling of 91293491 in words is "ninety-one million, two hundred ninety-three thousand, four hundred ninety-one".