91493251 has 4 divisors (see below), whose sum is σ = 91571904. Its totient is φ = 91414600.

The previous prime is 91493243. The next prime is 91493273. The reversal of 91493251 is 15239419.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91493251 - 2³ = 91493243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91493221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37555 + ... + 39916.

It is an arithmetic number, because the mean of its divisors is an integer number (22892976).

Almost surely, 2^91493251 is an apocalyptic number.

91493251 is a deficient number, since it is larger than the sum of its proper divisors (78653).

91493251 is a wasteful number, since it uses less digits than its factorization.

91493251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78652.

The product of its digits is 9720, while the sum is 34.

The square root of 91493251 is about 9565.2104524678. The cubic root of 91493251 is about 450.6053597639.

The spelling of 91493251 in words is "ninety-one million, four hundred ninety-three thousand, two hundred fifty-one".