91301221 has 8 divisors (see below), whose sum is σ = 99698688. Its totient is φ = 82920000.

The previous prime is 91301209. The next prime is 91301227. The reversal of 91301221 is 12210319.

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 91301221 - 2⁹ = 91300709 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 (91301227) 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 7 ways as a sum of consecutive naturals, for example, 9756 + ... + 16666.

It is an arithmetic number, because the mean of its divisors is an integer number (12462336).

Almost surely, 2^91301221 is an apocalyptic number.

It is an amenable number.

91301221 is a deficient number, since it is larger than the sum of its proper divisors (8397467).

91301221 is a wasteful number, since it uses less digits than its factorization.

91301221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8123.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 91301221 is about 9555.1672408179. The cubic root of 91301221 is about 450.2898889343.

The spelling of 91301221 in words is "ninety-one million, three hundred one thousand, two hundred twenty-one".