91254191 has 4 divisors (see below), whose sum is σ = 104290512. Its totient is φ = 78217872.

The previous prime is 91254157. The next prime is 91254197. The reversal of 91254191 is 19145219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19145219 = 223 ⋅85853.

It is a cyclic number.

It is not a de Polignac number, because 91254191 - 2²⁶ = 24145327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91254197) 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, 6518150 + ... + 6518163.

It is an arithmetic number, because the mean of its divisors is an integer number (26072628).

Almost surely, 2^91254191 is an apocalyptic number.

91254191 is a deficient number, since it is larger than the sum of its proper divisors (13036321).

91254191 is a wasteful number, since it uses less digits than its factorization.

91254191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13036320.

The product of its digits is 3240, while the sum is 32.

The square root of 91254191 is about 9552.7059517186. The cubic root of 91254191 is about 450.2125596629.

The spelling of 91254191 in words is "ninety-one million, two hundred fifty-four thousand, one hundred ninety-one".