181812849 has 16 divisors (see below), whose sum is σ = 245799360. Its totient is φ = 119525120.

The previous prime is 181812847. The next prime is 181812853. The reversal of 181812849 is 948218181.

It is a cyclic number.

It is not a de Polignac number, because 181812849 - 2¹ = 181812847 is a prime.

It is a super-2 number, since 2×181812849² = 66111824122993602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 181812849.

It is not an unprimeable number, because it can be changed into a prime (181812847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138454 + ... + 139760.

It is an arithmetic number, because the mean of its divisors is an integer number (15362460).

Almost surely, 2^181812849 is an apocalyptic number.

It is an amenable number.

181812849 is a deficient number, since it is larger than the sum of its proper divisors (63986511).

181812849 is a wasteful number, since it uses less digits than its factorization.

181812849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920.

The product of its digits is 36864, while the sum is 42.

The square root of 181812849 is about 13483.7995016242. The cubic root of 181812849 is about 566.5107961528.

The spelling of 181812849 in words is "one hundred eighty-one million, eight hundred twelve thousand, eight hundred forty-nine".