1800816181 has 8 divisors (see below), whose sum is σ = 1899244800. Its totient is φ = 1702752480.

The previous prime is 1800816167. The next prime is 1800816209. The reversal of 1800816181 is 1816180081.

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

It is a cyclic number.

It is not a de Polignac number, because 1800816181 - 2¹³ = 1800807989 is a prime.

It is a super-2 number, since 2×1800816181² = 6485877835502849522, 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 (1800816131) 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, 81061 + ... + 100858.

It is an arithmetic number, because the mean of its divisors is an integer number (237405600).

Almost surely, 2^1800816181 is an apocalyptic number.

It is an amenable number.

1800816181 is a deficient number, since it is larger than the sum of its proper divisors (98428619).

1800816181 is a wasteful number, since it uses less digits than its factorization.

1800816181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182459.

The product of its (nonzero) digits is 3072, while the sum is 34.

The square root of 1800816181 is about 42436.0245663988. The cubic root of 1800816181 is about 1216.6242297661.

The spelling of 1800816181 in words is "one billion, eight hundred million, eight hundred sixteen thousand, one hundred eighty-one".