91665357 has 32 divisors (see below), whose sum is σ = 145367040. Its totient is φ = 50276160.

The previous prime is 91665341. The next prime is 91665383. The reversal of 91665357 is 75356619.

It is a happy number.

It is not a de Polignac number, because 91665357 - 2⁴ = 91665341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91665307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89983 + ... + 90995.

It is an arithmetic number, because the mean of its divisors is an integer number (4542720).

Almost surely, 2^91665357 is an apocalyptic number.

It is an amenable number.

91665357 is a deficient number, since it is larger than the sum of its proper divisors (53701683).

91665357 is a wasteful number, since it uses less digits than its factorization.

91665357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193.

The product of its digits is 170100, while the sum is 42.

The square root of 91665357 is about 9574.2026822081. The cubic root of 91665357 is about 450.8877241601.

The spelling of 91665357 in words is "ninety-one million, six hundred sixty-five thousand, three hundred fifty-seven".