91029939 has 32 divisors (see below), whose sum is σ = 162968064. Its totient is φ = 43649280.

The previous prime is 91029901. The next prime is 91029943. The reversal of 91029939 is 93992019.

It is a happy number.

It is not a de Polignac number, because 91029939 - 2⁹ = 91029427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91029939.

It is not an unprimeable number, because it can be changed into a prime (91029949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12154 + ... + 18159.

It is an arithmetic number, because the mean of its divisors is an integer number (5092752).

Almost surely, 2^91029939 is an apocalyptic number.

91029939 is a deficient number, since it is larger than the sum of its proper divisors (71938125).

91029939 is a wasteful number, since it uses less digits than its factorization.

91029939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30347.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 91029939 is about 9540.9611151078. The cubic root of 91029939 is about 449.8434665435.

The spelling of 91029939 in words is "ninety-one million, twenty-nine thousand, nine hundred thirty-nine".