222145639 has 2 divisors, whose sum is σ = 222145640. Its totient is φ = 222145638.

The previous prime is 222145621. The next prime is 222145711. The reversal of 222145639 is 936541222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222145639 - 2⁵ = 222145607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222145619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111072819 + 111072820.

It is an arithmetic number, because the mean of its divisors is an integer number (111072820).

Almost surely, 2^222145639 is an apocalyptic number.

222145639 is a deficient number, since it is larger than the sum of its proper divisors (1).

222145639 is an equidigital number, since it uses as much as digits as its factorization.

222145639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 222145639 is about 14904.5509492906. The cubic root of 222145639 is about 605.6372758077.

It can be divided in two parts, 222145 and 639, that added together give a square (222784 = 472²).

The spelling of 222145639 in words is "two hundred twenty-two million, one hundred forty-five thousand, six hundred thirty-nine".