91665493 has 8 divisors (see below), whose sum is σ = 93485336. Its totient is φ = 89856000.

The previous prime is 91665439. The next prime is 91665503. The reversal of 91665493 is 39456619.

It can be written as a sum of positive squares in 4 ways, for example, as 4485924 + 87179569 = 2118^2 + 9337^2 .

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 91665493 - 2²¹ = 89568341 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 (91615493) 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, 16693 + ... + 21493.

It is an arithmetic number, because the mean of its divisors is an integer number (11685667).

Almost surely, 2^91665493 is an apocalyptic number.

It is an amenable number.

91665493 is a deficient number, since it is larger than the sum of its proper divisors (1819843).

91665493 is a wasteful number, since it uses less digits than its factorization.

91665493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5175.

The product of its digits is 174960, while the sum is 43.

The square root of 91665493 is about 9574.2097846245. The cubic root of 91665493 is about 450.8879471477.

The spelling of 91665493 in words is "ninety-one million, six hundred sixty-five thousand, four hundred ninety-three".