91720201 has 8 divisors (see below), whose sum is σ = 96763680. Its totient is φ = 86698368.

The previous prime is 91720199. The next prime is 91720249. The reversal of 91720201 is 10202719.

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

It is not a de Polignac number, because 91720201 - 2¹ = 91720199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91720801) 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, 3705 + ... + 14041.

It is an arithmetic number, because the mean of its divisors is an integer number (12095460).

Almost surely, 2^91720201 is an apocalyptic number.

It is an amenable number.

91720201 is a deficient number, since it is larger than the sum of its proper divisors (5043479).

91720201 is a wasteful number, since it uses less digits than its factorization.

91720201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10823.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 91720201 is about 9577.0664088749. The cubic root of 91720201 is about 450.9776292855.

The spelling of 91720201 in words is "ninety-one million, seven hundred twenty thousand, two hundred one".