222138913 has 2 divisors, whose sum is σ = 222138914. Its totient is φ = 222138912.

The previous prime is 222138911. The next prime is 222138919. The reversal of 222138913 is 319831222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217503504 + 4635409 = 14748^2 + 2153^2 .

It is a cyclic number.

It is not a de Polignac number, because 222138913 - 2¹ = 222138911 is a prime.

Together with 222138911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (222138911) 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, 111069456 + 111069457.

It is an arithmetic number, because the mean of its divisors is an integer number (111069457).

Almost surely, 2^222138913 is an apocalyptic number.

It is an amenable number.

222138913 is a deficient number, since it is larger than the sum of its proper divisors (1).

222138913 is an equidigital number, since it uses as much as digits as its factorization.

222138913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 222138913 is about 14904.3253118013. The cubic root of 222138913 is about 605.6311633651.

The spelling of 222138913 in words is "two hundred twenty-two million, one hundred thirty-eight thousand, nine hundred thirteen".