818922919 has 4 divisors (see below), whose sum is σ = 820304496. Its totient is φ = 817541344.

The previous prime is 818922869. The next prime is 818922931. The reversal of 818922919 is 919229818.

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 818922919 - 2¹⁷ = 818791847 is a prime.

It is a super-2 number, since 2×818922919² = 1341269494526961122, which contains 22 as substring.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (818922959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689899 + ... + 691084.

It is an arithmetic number, because the mean of its divisors is an integer number (205076124).

Almost surely, 2^818922919 is an apocalyptic number.

818922919 is a deficient number, since it is larger than the sum of its proper divisors (1381577).

818922919 is a wasteful number, since it uses less digits than its factorization.

818922919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381576.

The product of its digits is 186624, while the sum is 49.

The square root of 818922919 is about 28616.8292967617. The cubic root of 818922919 is about 935.5801708739.

The spelling of 818922919 in words is "eight hundred eighteen million, nine hundred twenty-two thousand, nine hundred nineteen".