2181941579 has 2 divisors, whose sum is σ = 2181941580. Its totient is φ = 2181941578.

The previous prime is 2181941563. The next prime is 2181941581. The reversal of 2181941579 is 9751491812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2181941579 - 2⁴ = 2181941563 is a prime.

Together with 2181941581, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2181931579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090970789 + 1090970790.

It is an arithmetic number, because the mean of its divisors is an integer number (1090970790).

Almost surely, 2^2181941579 is an apocalyptic number.

2181941579 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181941579 is an equidigital number, since it uses as much as digits as its factorization.

2181941579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 47.

The square root of 2181941579 is about 46711.2575189322. The cubic root of 2181941579 is about 1297.0230855037.

The spelling of 2181941579 in words is "two billion, one hundred eighty-one million, nine hundred forty-one thousand, five hundred seventy-nine".