91665001 has 4 divisors (see below), whose sum is σ = 91725952. Its totient is φ = 91604052.

The previous prime is 91664999. The next prime is 91665029. The reversal of 91665001 is 10056619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91665001 - 2¹ = 91664999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91665031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28161 + ... + 31246.

It is an arithmetic number, because the mean of its divisors is an integer number (22931488).

Almost surely, 2^91665001 is an apocalyptic number.

It is an amenable number.

91665001 is a deficient number, since it is larger than the sum of its proper divisors (60951).

91665001 is a wasteful number, since it uses less digits than its factorization.

91665001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60950.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 91665001 is about 9574.1840905635. The cubic root of 91665001 is about 450.8871404564.

The spelling of 91665001 in words is "ninety-one million, six hundred sixty-five thousand, one".