81092807 has 4 divisors (see below), whose sum is σ = 83708736. Its totient is φ = 78476880.

The previous prime is 81092783. The next prime is 81092819. The reversal of 81092807 is 70829018.

It is a happy number.

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 81092807 - 2¹⁸ = 80830663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81092897) 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 3 ways as a sum of consecutive naturals, for example, 1307918 + ... + 1307979.

It is an arithmetic number, because the mean of its divisors is an integer number (20927184).

Almost surely, 2^81092807 is an apocalyptic number.

81092807 is a deficient number, since it is larger than the sum of its proper divisors (2615929).

81092807 is a wasteful number, since it uses less digits than its factorization.

81092807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2615928.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 81092807 is about 9005.1544684142. The cubic root of 81092807 is about 432.8400559908.

The spelling of 81092807 in words is "eighty-one million, ninety-two thousand, eight hundred seven".