91038729 has 12 divisors (see below), whose sum is σ = 123380016. Its totient is φ = 59697792.

The previous prime is 91038691. The next prime is 91038751. The reversal of 91038729 is 92783019.

It is not a de Polignac number, because 91038729 - 2¹¹ = 91036681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91038769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134937 + ... + 135609.

It is an arithmetic number, because the mean of its divisors is an integer number (10281668).

Almost surely, 2^91038729 is an apocalyptic number.

It is an amenable number.

91038729 is a deficient number, since it is larger than the sum of its proper divisors (32341287).

91038729 is an frugal number, since it uses more digits than its factorization.

91038729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416 (or 743 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 91038729 is about 9541.4217494040. The cubic root of 91038729 is about 449.8579452847.

The spelling of 91038729 in words is "ninety-one million, thirty-eight thousand, seven hundred twenty-nine".