222544145 has 4 divisors (see below), whose sum is σ = 267052980. Its totient is φ = 178035312.

The previous prime is 222544141. The next prime is 222544163. The reversal of 222544145 is 541445222.

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 47458321 + 175085824 = 6889^2 + 13232^2 .

It is a cyclic number.

It is not a de Polignac number, because 222544145 - 2² = 222544141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (222544141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22254410 + ... + 22254419.

It is an arithmetic number, because the mean of its divisors is an integer number (66763245).

Almost surely, 2^222544145 is an apocalyptic number.

It is an amenable number.

222544145 is a deficient number, since it is larger than the sum of its proper divisors (44508835).

222544145 is an equidigital number, since it uses as much as digits as its factorization.

222544145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44508834.

The product of its digits is 12800, while the sum is 29.

The square root of 222544145 is about 14917.9135605486. The cubic root of 222544145 is about 605.9992094084. Note that the first 3 decimals are identical.

Adding to 222544145 its reverse (541445222), we get a palindrome (763989367).

The spelling of 222544145 in words is "two hundred twenty-two million, five hundred forty-four thousand, one hundred forty-five".