91691085 has 8 divisors (see below), whose sum is σ = 146705760. Its totient is φ = 48901904.

The previous prime is 91691077. The next prime is 91691107. The reversal of 91691085 is 58019619.

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 91691085 - 2³ = 91691077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3056355 + ... + 3056384.

It is an arithmetic number, because the mean of its divisors is an integer number (18338220).

Almost surely, 2^91691085 is an apocalyptic number.

It is an amenable number.

91691085 is a deficient number, since it is larger than the sum of its proper divisors (55014675).

91691085 is a wasteful number, since it uses less digits than its factorization.

91691085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6112747.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 91691085 is about 9575.5461985205. The cubic root of 91691085 is about 450.9299042327.

The spelling of 91691085 in words is "ninety-one million, six hundred ninety-one thousand, eighty-five".