91591801 has 16 divisors (see below), whose sum is σ = 111424896. Its totient is φ = 73495296.

The previous prime is 91591781. The next prime is 91591807. The reversal of 91591801 is 10819519.

It is not a de Polignac number, because 91591801 - 2⁹ = 91591289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91591807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21490 + ... + 25396.

It is an arithmetic number, because the mean of its divisors is an integer number (6964056).

Almost surely, 2^91591801 is an apocalyptic number.

It is an amenable number.

91591801 is a deficient number, since it is larger than the sum of its proper divisors (19833095).

91591801 is a wasteful number, since it uses less digits than its factorization.

91591801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4128.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 91591801 is about 9570.3605470222. The cubic root of 91591801 is about 450.7670883547.

The spelling of 91591801 in words is "ninety-one million, five hundred ninety-one thousand, eight hundred one".