810818919 has 12 divisors (see below), whose sum is σ = 1208963392. Its totient is φ = 523108800.

The previous prime is 810818909. The next prime is 810818923. The reversal of 810818919 is 919818018.

It is not a de Polignac number, because 810818919 - 2⁸ = 810818663 is a prime.

It is a super-2 number, since 2×810818919² = 1314854638816657122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810818909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1452802 + ... + 1453359.

Almost surely, 2^810818919 is an apocalyptic number.

810818919 is a deficient number, since it is larger than the sum of its proper divisors (398144473).

810818919 is a wasteful number, since it uses less digits than its factorization.

810818919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906198 (or 2906195 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 45.

The square root of 810818919 is about 28474.8822473421. The cubic root of 810818919 is about 932.4837906365.

It can be divided in two parts, 81081 and 8919, that added together give a square (90000 = 300²).

The spelling of 810818919 in words is "eight hundred ten million, eight hundred eighteen thousand, nine hundred nineteen".