81058895 has 4 divisors (see below), whose sum is σ = 97270680. Its totient is φ = 64847112.

The previous prime is 81058871. The next prime is 81058903. The reversal of 81058895 is 59885018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81058895 - 2²⁰ = 80010319 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8105885 + ... + 8105894.

It is an arithmetic number, because the mean of its divisors is an integer number (24317670).

Almost surely, 2^81058895 is an apocalyptic number.

81058895 is a deficient number, since it is larger than the sum of its proper divisors (16211785).

81058895 is a wasteful number, since it uses less digits than its factorization.

81058895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16211784.

The product of its (nonzero) digits is 115200, while the sum is 44.

The square root of 81058895 is about 9003.2713499039. The cubic root of 81058895 is about 432.7797114748.

The spelling of 81058895 in words is "eighty-one million, fifty-eight thousand, eight hundred ninety-five".