91481791 has 4 divisors (see below), whose sum is σ = 91864800. Its totient is φ = 91098784.

The previous prime is 91481773. The next prime is 91481809. The reversal of 91481791 is 19718419.

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

It is an interprime number because it is at equal distance from previous prime (91481773) and next prime (91481809).

It is a cyclic number.

It is not a de Polignac number, because 91481791 - 2⁵ = 91481759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91481711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191146 + ... + 191623.

It is an arithmetic number, because the mean of its divisors is an integer number (22966200).

Almost surely, 2^91481791 is an apocalyptic number.

91481791 is a deficient number, since it is larger than the sum of its proper divisors (383009).

91481791 is a wasteful number, since it uses less digits than its factorization.

91481791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383008.

The product of its digits is 18144, while the sum is 40.

The square root of 91481791 is about 9564.6113878192. The cubic root of 91481791 is about 450.5865454325.

The spelling of 91481791 in words is "ninety-one million, four hundred eighty-one thousand, seven hundred ninety-one".