222748909 has 4 divisors (see below), whose sum is σ = 235851804. Its totient is φ = 209646016.

The previous prime is 222748907. The next prime is 222748921. The reversal of 222748909 is 909847222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 144072009 + 78676900 = 12003^2 + 8870^2 .

It is a cyclic number.

It is not a de Polignac number, because 222748909 - 2¹ = 222748907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222748907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6551422 + ... + 6551455.

It is an arithmetic number, because the mean of its divisors is an integer number (58962951).

Almost surely, 2^222748909 is an apocalyptic number.

It is an amenable number.

222748909 is a deficient number, since it is larger than the sum of its proper divisors (13102895).

222748909 is a wasteful number, since it uses less digits than its factorization.

222748909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13102894.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 222748909 is about 14924.7750066793. The cubic root of 222748909 is about 606.1850134188.

The spelling of 222748909 in words is "two hundred twenty-two million, seven hundred forty-eight thousand, nine hundred nine".