91240491 has 12 divisors (see below), whose sum is σ = 123765032. Its totient is φ = 59789184.

The previous prime is 91240477. The next prime is 91240529. The reversal of 91240491 is 19404219.

It is not a de Polignac number, because 91240491 - 2⁶ = 91240427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91240421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6075 + ... + 14811.

Almost surely, 2^91240491 is an apocalyptic number.

91240491 is a deficient number, since it is larger than the sum of its proper divisors (32524541).

91240491 is an equidigital number, since it uses as much as digits as its factorization.

91240491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8858 (or 8799 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 91240491 is about 9551.9888504960. The cubic root of 91240491 is about 450.1900283845.

The spelling of 91240491 in words is "ninety-one million, two hundred forty thousand, four hundred ninety-one".