818606819 has 4 divisors (see below), whose sum is σ = 818709096. Its totient is φ = 818504544.

The previous prime is 818606807. The next prime is 818606843. The reversal of 818606819 is 918606818.

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 818606819 - 2⁸ = 818606563 is a prime.

It is a super-2 number, since 2×818606819² = 1340234248226597522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818606879) 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, 38009 + ... + 55514.

It is an arithmetic number, because the mean of its divisors is an integer number (204677274).

Almost surely, 2^818606819 is an apocalyptic number.

818606819 is a deficient number, since it is larger than the sum of its proper divisors (102277).

818606819 is an equidigital number, since it uses as much as digits as its factorization.

818606819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102276.

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 818606819 is about 28611.3057898447. The cubic root of 818606819 is about 935.4597790176.

Subtracting 818606819 from its reverse (918606818), we obtain a palindrome (99999999).

The spelling of 818606819 in words is "eight hundred eighteen million, six hundred six thousand, eight hundred nineteen".