22181639 has 2 divisors, whose sum is σ = 22181640. Its totient is φ = 22181638.

The previous prime is 22181629. The next prime is 22181641. The reversal of 22181639 is 93618122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22181639 is a prime.

Together with 22181641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22181629) 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, 11090819 + 11090820.

It is an arithmetic number, because the mean of its divisors is an integer number (11090820).

Almost surely, 2^22181639 is an apocalyptic number.

22181639 is a deficient number, since it is larger than the sum of its proper divisors (1).

22181639 is an equidigital number, since it uses as much as digits as its factorization.

22181639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 22181639 is about 4709.7387401001. The cubic root of 22181639 is about 280.9729714001.

The spelling of 22181639 in words is "twenty-two million, one hundred eighty-one thousand, six hundred thirty-nine".