818809087 has 4 divisors (see below), whose sum is σ = 824304600. Its totient is φ = 813313576.

The previous prime is 818809051. The next prime is 818809091. The reversal of 818809087 is 780908818.

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 818809087 - 2⁷ = 818808959 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 818809087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818809007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2747533 + ... + 2747830.

It is an arithmetic number, because the mean of its divisors is an integer number (206076150).

Almost surely, 2^818809087 is an apocalyptic number.

818809087 is a deficient number, since it is larger than the sum of its proper divisors (5495513).

818809087 is a wasteful number, since it uses less digits than its factorization.

818809087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5495512.

The product of its (nonzero) digits is 258048, while the sum is 49.

The square root of 818809087 is about 28614.8403280536. The cubic root of 818809087 is about 935.5368196644.

The spelling of 818809087 in words is "eight hundred eighteen million, eight hundred nine thousand, eighty-seven".