91045 has 8 divisors (see below), whose sum is σ = 110880. Its totient is φ = 71760.

The previous prime is 91033. The next prime is 91079. The reversal of 91045 is 54019.

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

It is not a de Polignac number, because 91045 - 2⁷ = 90917 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, 586 + ... + 724.

It is an arithmetic number, because the mean of its divisors is an integer number (13860).

2⁹¹⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

91045 is a deficient number, since it is larger than the sum of its proper divisors (19835).

91045 is a wasteful number, since it uses less digits than its factorization.

91045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 91045 is about 301.7366401351. The cubic root of 91045 is about 44.9868274202.

The spelling of 91045 in words is "ninety-one thousand, forty-five".