91124551 has 16 divisors (see below), whose sum is σ = 114393600. Its totient is φ = 70776288.

The previous prime is 91124549. The next prime is 91124567. The reversal of 91124551 is 15542119.

It is a cyclic number.

It is not a de Polignac number, because 91124551 - 2¹ = 91124549 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 (91124521) 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, 11836 + ... + 17953.

It is an arithmetic number, because the mean of its divisors is an integer number (7149600).

Almost surely, 2^91124551 is an apocalyptic number.

91124551 is a deficient number, since it is larger than the sum of its proper divisors (23269049).

91124551 is a wasteful number, since it uses less digits than its factorization.

91124551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29838.

The product of its digits is 1800, while the sum is 28.

The square root of 91124551 is about 9545.9180281417. The cubic root of 91124551 is about 449.9992609041. Note that the first 3 decimals are identical.

The spelling of 91124551 in words is "ninety-one million, one hundred twenty-four thousand, five hundred fifty-one".