91605671 has 8 divisors (see below), whose sum is σ = 92743200. Its totient is φ = 90473760.

The previous prime is 91605667. The next prime is 91605697. The reversal of 91605671 is 17650619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91605671 - 2² = 91605667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91605601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37961 + ... + 40301.

It is an arithmetic number, because the mean of its divisors is an integer number (11592900).

Almost surely, 2^91605671 is an apocalyptic number.

91605671 is a deficient number, since it is larger than the sum of its proper divisors (1137529).

91605671 is a wasteful number, since it uses less digits than its factorization.

91605671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 91605671 is about 9571.0851526878. The cubic root of 91605671 is about 450.7898408423.

The spelling of 91605671 in words is "ninety-one million, six hundred five thousand, six hundred seventy-one".