91661733 has 8 divisors (see below), whose sum is σ = 135795200. Its totient is φ = 61107804.

The previous prime is 91661729. The next prime is 91661741. The reversal of 91661733 is 33716619.

91661733 is a `hidden beast` number, since 9 + 1 + 6 + 617 + 33 = 666.

It is not a de Polignac number, because 91661733 - 2² = 91661729 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 (91661753) 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, 1697413 + ... + 1697466.

It is an arithmetic number, because the mean of its divisors is an integer number (16974400).

Almost surely, 2^91661733 is an apocalyptic number.

It is an amenable number.

91661733 is a deficient number, since it is larger than the sum of its proper divisors (44133467).

91661733 is a wasteful number, since it uses less digits than its factorization.

91661733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3394888 (or 3394882 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 91661733 is about 9574.0134217579. The cubic root of 91661733 is about 450.8817821165.

The spelling of 91661733 in words is "ninety-one million, six hundred sixty-one thousand, seven hundred thirty-three".