22939381981 has 2 divisors, whose sum is σ = 22939381982. Its totient is φ = 22939381980.

The previous prime is 22939381951. The next prime is 22939381991. The reversal of 22939381981 is 18918393922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13255837956 + 9683544025 = 115134^2 + 98405^2 .

It is a cyclic number.

It is not a de Polignac number, because 22939381981 - 2¹¹ = 22939379933 is a prime.

It is a super-2 number, since 2×22939381981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22939381951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11469690990 + 11469690991.

It is an arithmetic number, because the mean of its divisors is an integer number (11469690991).

Almost surely, 2^22939381981 is an apocalyptic number.

It is an amenable number.

22939381981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22939381981 is an equidigital number, since it uses as much as digits as its factorization.

22939381981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 55.

The spelling of 22939381981 in words is "twenty-two billion, nine hundred thirty-nine million, three hundred eighty-one thousand, nine hundred eighty-one".