91042729 has 4 divisors (see below), whose sum is σ = 91154176. Its totient is φ = 90931284.

The previous prime is 91042709. The next prime is 91042741. The reversal of 91042729 is 92724019.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92724019 = 6211 ⋅14929.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91042729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91042694 and 91042703.

It is not an unprimeable number, because it can be changed into a prime (91042709) 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, 54489 + ... + 56134.

It is an arithmetic number, because the mean of its divisors is an integer number (22788544).

Almost surely, 2^91042729 is an apocalyptic number.

It is an amenable number.

91042729 is a deficient number, since it is larger than the sum of its proper divisors (111447).

91042729 is a wasteful number, since it uses less digits than its factorization.

91042729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111446.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 91042729 is about 9541.6313594689. The cubic root of 91042729 is about 449.8645337094.

The spelling of 91042729 in words is "ninety-one million, forty-two thousand, seven hundred twenty-nine".