2181814879 has 2 divisors, whose sum is σ = 2181814880. Its totient is φ = 2181814878.

The previous prime is 2181814861. The next prime is 2181814909. The reversal of 2181814879 is 9784181812.

2181814879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2181814879 - 2¹³ = 2181806687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181814849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090907439 + 1090907440.

It is an arithmetic number, because the mean of its divisors is an integer number (1090907440).

Almost surely, 2^2181814879 is an apocalyptic number.

2181814879 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181814879 is an equidigital number, since it uses as much as digits as its factorization.

2181814879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 49.

The square root of 2181814879 is about 46709.9012951216. The cubic root of 2181814879 is about 1296.9979800338.

The spelling of 2181814879 in words is "two billion, one hundred eighty-one million, eight hundred fourteen thousand, eight hundred seventy-nine".