91080991 has 8 divisors (see below), whose sum is σ = 92793168. Its totient is φ = 89376000.

The previous prime is 91080953. The next prime is 91081021. The reversal of 91080991 is 19908019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91080991 - 2⁷ = 91080863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91080991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91080911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28431 + ... + 31471.

It is an arithmetic number, because the mean of its divisors is an integer number (11599146).

Almost surely, 2^91080991 is an apocalyptic number.

91080991 is a deficient number, since it is larger than the sum of its proper divisors (1712177).

91080991 is a wasteful number, since it uses less digits than its factorization.

91080991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 91080991 is about 9543.6361519077. The cubic root of 91080991 is about 449.9275455364.

The spelling of 91080991 in words is "ninety-one million, eighty thousand, nine hundred ninety-one".