91618161 has 8 divisors (see below), whose sum is σ = 122230080. Its totient is φ = 61042512.

The previous prime is 91618147. The next prime is 91618169. The reversal of 91618161 is 16181619.

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

It is not a de Polignac number, because 91618161 - 2⁵ = 91618129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91618169) 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, 2490 + ... + 13763.

It is an arithmetic number, because the mean of its divisors is an integer number (15278760).

Almost surely, 2^91618161 is an apocalyptic number.

It is an amenable number.

91618161 is a deficient number, since it is larger than the sum of its proper divisors (30611919).

91618161 is a wasteful number, since it uses less digits than its factorization.

91618161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18135.

The product of its digits is 2592, while the sum is 33.

The square root of 91618161 is about 9571.7376165459. The cubic root of 91618161 is about 450.8103275989.

The spelling of 91618161 in words is "ninety-one million, six hundred eighteen thousand, one hundred sixty-one".