91380729 has 16 divisors (see below), whose sum is σ = 140736960. Its totient is φ = 52124160.

The previous prime is 91380721. The next prime is 91380733. The reversal of 91380729 is 92708319.

It is not a de Polignac number, because 91380729 - 2³ = 91380721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91380721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80884 + ... + 82005.

It is an arithmetic number, because the mean of its divisors is an integer number (8796060).

Almost surely, 2^91380729 is an apocalyptic number.

It is an amenable number.

91380729 is a deficient number, since it is larger than the sum of its proper divisors (49356231).

91380729 is a wasteful number, since it uses less digits than its factorization.

91380729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162920.

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

The square root of 91380729 is about 9559.3268068416. The cubic root of 91380729 is about 450.4205599181.

The spelling of 91380729 in words is "ninety-one million, three hundred eighty thousand, seven hundred twenty-nine".