91368661 has 8 divisors (see below), whose sum is σ = 93571200. Its totient is φ = 89183952.

The previous prime is 91368649. The next prime is 91368671. The reversal of 91368661 is 16686319.

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 91368661 - 2²¹ = 89271509 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 (91368601) 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, 6216 + ... + 14878.

It is an arithmetic number, because the mean of its divisors is an integer number (11696400).

Almost surely, 2^91368661 is an apocalyptic number.

It is an amenable number.

91368661 is a deficient number, since it is larger than the sum of its proper divisors (2202539).

91368661 is a wasteful number, since it uses less digits than its factorization.

91368661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8915.

The product of its digits is 46656, while the sum is 40.

The square root of 91368661 is about 9558.6955700033. The cubic root of 91368661 is about 450.4007311034.

It can be divided in two parts, 91368 and 661, that added together give a palindrome (92029).

The spelling of 91368661 in words is "ninety-one million, three hundred sixty-eight thousand, six hundred sixty-one".