91891245 has 8 divisors (see below), whose sum is σ = 147026016. Its totient is φ = 49008656.

The previous prime is 91891213. The next prime is 91891259. The reversal of 91891245 is 54219819.

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 91891245 - 2⁵ = 91891213 is a prime.

It is a Curzon number.

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, 3063027 + ... + 3063056.

It is an arithmetic number, because the mean of its divisors is an integer number (18378252).

Almost surely, 2^91891245 is an apocalyptic number.

It is an amenable number.

91891245 is a deficient number, since it is larger than the sum of its proper divisors (55134771).

91891245 is a wasteful number, since it uses less digits than its factorization.

91891245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6126091.

The product of its digits is 25920, while the sum is 39.

The square root of 91891245 is about 9585.9921239275. The cubic root of 91891245 is about 451.2577897331.

The spelling of 91891245 in words is "ninety-one million, eight hundred ninety-one thousand, two hundred forty-five".