81058835 has 32 divisors (see below), whose sum is σ = 115915968. Its totient is φ = 53637120.

The previous prime is 81058801. The next prime is 81058843. The reversal of 81058835 is 53885018.

It is a de Polignac number, because none of the positive numbers 2^k-81058835 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 51419 + ... + 52971.

It is an arithmetic number, because the mean of its divisors is an integer number (3622374).

Almost surely, 2^81058835 is an apocalyptic number.

81058835 is a deficient number, since it is larger than the sum of its proper divisors (34857133).

81058835 is a wasteful number, since it uses less digits than its factorization.

81058835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655.

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 81058835 is about 9003.2680177811. The cubic root of 81058835 is about 432.7796046932.

The spelling of 81058835 in words is "eighty-one million, fifty-eight thousand, eight hundred thirty-five".