2181814887 has 8 divisors (see below), whose sum is σ = 3324670336. Its totient is φ = 1246751352.

The previous prime is 2181814879. The next prime is 2181814909. The reversal of 2181814887 is 7884181812.

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

It is not a de Polignac number, because 2181814887 - 2³ = 2181814879 is a prime.

It is a super-2 number, since 2×2181814887² = 9520632402269645538, 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 (2181814387) 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, 51947953 + ... + 51947994.

It is an arithmetic number, because the mean of its divisors is an integer number (415583792).

Almost surely, 2^2181814887 is an apocalyptic number.

2181814887 is a deficient number, since it is larger than the sum of its proper divisors (1142855449).

2181814887 is a wasteful number, since it uses less digits than its factorization.

2181814887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103895957.

The product of its digits is 229376, while the sum is 48.

The square root of 2181814887 is about 46709.9013807565. The cubic root of 2181814887 is about 1296.9979816190.

The spelling of 2181814887 in words is "two billion, one hundred eighty-one million, eight hundred fourteen thousand, eight hundred eighty-seven".