91660601 has 4 divisors (see below), whose sum is σ = 91999104. Its totient is φ = 91322100.

The previous prime is 91660567. The next prime is 91660643. The reversal of 91660601 is 10606619.

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 91660601 - 2⁶ = 91660537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91660001) 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, 168845 + ... + 169386.

It is an arithmetic number, because the mean of its divisors is an integer number (22999776).

Almost surely, 2^91660601 is an apocalyptic number.

It is an amenable number.

91660601 is a deficient number, since it is larger than the sum of its proper divisors (338503).

91660601 is a wasteful number, since it uses less digits than its factorization.

91660601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338502.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 91660601 is about 9573.9543032124. The cubic root of 91660601 is about 450.8799260156.

The spelling of 91660601 in words is "ninety-one million, six hundred sixty thousand, six hundred one".