91660617 has 24 divisors (see below), whose sum is σ = 147569760. Its totient is φ = 54483840.

The previous prime is 91660567. The next prime is 91660643. The reversal of 91660617 is 71606619.

It is not a de Polignac number, because 91660617 - 2¹⁰ = 91659593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91660697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12859 + ... + 18672.

It is an arithmetic number, because the mean of its divisors is an integer number (6148740).

Almost surely, 2^91660617 is an apocalyptic number.

It is an amenable number.

91660617 is a deficient number, since it is larger than the sum of its proper divisors (55909143).

91660617 is a wasteful number, since it uses less digits than its factorization.

91660617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31573 (or 31570 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 91660617 is about 9573.9551388128. The cubic root of 91660617 is about 450.8799522504.

The spelling of 91660617 in words is "ninety-one million, six hundred sixty thousand, six hundred seventeen".