808181819 has 8 divisors (see below), whose sum is σ = 855973728. Its totient is φ = 760417920.

The previous prime is 808181813. The next prime is 808181821. The reversal of 808181819 is 918181808.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-808181819 is a prime.

It is a super-2 number, since 2×808181819² = 1306315705124297522, which contains 22 as substring.

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 808181819.

It is not an unprimeable number, because it can be changed into a prime (808181813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94874 + ... + 103040.

It is an arithmetic number, because the mean of its divisors is an integer number (106996716).

Almost surely, 2^808181819 is an apocalyptic number.

808181819 is a deficient number, since it is larger than the sum of its proper divisors (47791909).

808181819 is a wasteful number, since it uses less digits than its factorization.

808181819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14005.

The product of its (nonzero) digits is 36864, while the sum is 44.

The square root of 808181819 is about 28428.5388122570. The cubic root of 808181819 is about 931.4717587644.

The spelling of 808181819 in words is "eight hundred eight million, one hundred eighty-one thousand, eight hundred nineteen".