91667617 has 4 divisors (see below), whose sum is σ = 91689136. Its totient is φ = 91646100.

The previous prime is 91667599. The next prime is 91667663. The reversal of 91667617 is 71676619.

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 a de Polignac number, because none of the positive numbers 2^k-91667617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91667717) 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, 1983 + ... + 13684.

It is an arithmetic number, because the mean of its divisors is an integer number (22922284).

Almost surely, 2^91667617 is an apocalyptic number.

It is an amenable number.

91667617 is a deficient number, since it is larger than the sum of its proper divisors (21519).

91667617 is a wasteful number, since it uses less digits than its factorization.

91667617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21518.

The product of its digits is 95256, while the sum is 43.

The square root of 91667617 is about 9574.3207069745. The cubic root of 91667617 is about 450.8914296599.

The spelling of 91667617 in words is "ninety-one million, six hundred sixty-seven thousand, six hundred seventeen".