91744121 has 24 divisors (see below), whose sum is σ = 113717736. Its totient is φ = 73543680.

The previous prime is 91744111. The next prime is 91744129. The reversal of 91744121 is 12144719.

It can be written as a sum of positive squares in 4 ways, for example, as 54228496 + 37515625 = 7364^2 + 6125^2 .

It is not a de Polignac number, because 91744121 - 2¹⁴ = 91727737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91744129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200525 + ... + 200981.

It is an arithmetic number, because the mean of its divisors is an integer number (4738239).

Almost surely, 2^91744121 is an apocalyptic number.

It is an amenable number.

91744121 is a deficient number, since it is larger than the sum of its proper divisors (21973615).

91744121 is a wasteful number, since it uses less digits than its factorization.

91744121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 722 counting only the distinct ones).

The product of its digits is 2016, while the sum is 29.

The square root of 91744121 is about 9578.3151441159. The cubic root of 91744121 is about 451.0168298366.

The spelling of 91744121 in words is "ninety-one million, seven hundred forty-four thousand, one hundred twenty-one".