81818595 has 24 divisors (see below), whose sum is σ = 142769952. Its totient is φ = 43344000.

The previous prime is 81818563. The next prime is 81818609. The reversal of 81818595 is 59581818.

It is not a de Polignac number, because 81818595 - 2⁵ = 81818563 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 81818595.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 775 + ... + 12815.

It is an arithmetic number, because the mean of its divisors is an integer number (5948748).

Almost surely, 2^81818595 is an apocalyptic number.

81818595 is a deficient number, since it is larger than the sum of its proper divisors (60951357).

81818595 is a wasteful number, since it uses less digits than its factorization.

81818595 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12203 (or 12200 counting only the distinct ones).

The product of its digits is 115200, while the sum is 45.

The square root of 81818595 is about 9045.3631767884. The cubic root of 81818595 is about 434.1275418505.

The spelling of 81818595 in words is "eighty-one million, eight hundred eighteen thousand, five hundred ninety-five".