91201191 has 8 divisors (see below), whose sum is σ = 121793280. Its totient is φ = 60704952.

The previous prime is 91201183. The next prime is 91201199. The reversal of 91201191 is 19110219.

It is an interprime number because it is at equal distance from previous prime (91201183) and next prime (91201199).

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

It is not a de Polignac number, because 91201191 - 2³ = 91201183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91201199) 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, 21711 + ... + 25568.

It is an arithmetic number, because the mean of its divisors is an integer number (15224160).

Almost surely, 2^91201191 is an apocalyptic number.

91201191 is a deficient number, since it is larger than the sum of its proper divisors (30592089).

91201191 is a wasteful number, since it uses less digits than its factorization.

91201191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47925.

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 91201191 is about 9549.9314657227. The cubic root of 91201191 is about 450.1253823457.

The spelling of 91201191 in words is "ninety-one million, two hundred one thousand, one hundred ninety-one".