222538709 has 2 divisors, whose sum is σ = 222538710. Its totient is φ = 222538708.

The previous prime is 222538669. The next prime is 222538711. The reversal of 222538709 is 907835222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177688900 + 44849809 = 13330^2 + 6697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222538709 is a prime.

Together with 222538711, 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 (222538009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111269354 + 111269355.

It is an arithmetic number, because the mean of its divisors is an integer number (111269355).

Almost surely, 2^222538709 is an apocalyptic number.

It is an amenable number.

222538709 is a deficient number, since it is larger than the sum of its proper divisors (1).

222538709 is an equidigital number, since it uses as much as digits as its factorization.

222538709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 222538709 is about 14917.7313623754. The cubic root of 222538709 is about 605.9942751985.

The spelling of 222538709 in words is "two hundred twenty-two million, five hundred thirty-eight thousand, seven hundred nine".