91242173 has 16 divisors (see below), whose sum is σ = 106292736. Its totient is φ = 77486640.

The previous prime is 91242169. The next prime is 91242187. The reversal of 91242173 is 37124219.

It is not a de Polignac number, because 91242173 - 2² = 91242169 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91242133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6686 + ... + 15072.

It is an arithmetic number, because the mean of its divisors is an integer number (6643296).

Almost surely, 2^91242173 is an apocalyptic number.

It is an amenable number.

91242173 is a deficient number, since it is larger than the sum of its proper divisors (15050563).

91242173 is a wasteful number, since it uses less digits than its factorization.

91242173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8464.

The product of its digits is 3024, while the sum is 29.

The square root of 91242173 is about 9552.0768945816. The cubic root of 91242173 is about 450.1927947549.

The spelling of 91242173 in words is "ninety-one million, two hundred forty-two thousand, one hundred seventy-three".