91663161 has 8 divisors (see below), whose sum is σ = 123038400. Its totient is φ = 60698352.

The previous prime is 91663151. The next prime is 91663193. The reversal of 91663161 is 16136619.

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

It is not a de Polignac number, because 91663161 - 2¹⁴ = 91646777 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (91663151) 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, 102085 + ... + 102978.

It is an arithmetic number, because the mean of its divisors is an integer number (15379800).

Almost surely, 2^91663161 is an apocalyptic number.

It is an amenable number.

91663161 is a deficient number, since it is larger than the sum of its proper divisors (31375239).

91663161 is a wasteful number, since it uses less digits than its factorization.

91663161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205215.

The product of its digits is 5832, while the sum is 33.

The square root of 91663161 is about 9574.0879983422. The cubic root of 91663161 is about 450.8841235365.

The spelling of 91663161 in words is "ninety-one million, six hundred sixty-three thousand, one hundred sixty-one".