222036561 has 6 divisors (see below), whose sum is σ = 320719490. Its totient is φ = 148024368.

The previous prime is 222036559. The next prime is 222036571. The reversal of 222036561 is 165630222.

222036561 is a `hidden beast` number, since 2 + 2 + 2 + 0 + 3 + 656 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 207360000 + 14676561 = 14400^2 + 3831^2 .

It is not a de Polignac number, because 222036561 - 2¹ = 222036559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222036511) 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 5 ways as a sum of consecutive naturals, for example, 12335356 + ... + 12335373.

Almost surely, 2^222036561 is an apocalyptic number.

It is an amenable number.

222036561 is a deficient number, since it is larger than the sum of its proper divisors (98682929).

222036561 is a wasteful number, since it uses less digits than its factorization.

222036561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24670735 (or 24670732 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 222036561 is about 14900.8912820677. The cubic root of 222036561 is about 605.5381328632.

Adding to 222036561 its reverse (165630222), we get a palindrome (387666783).

It can be divided in two parts, 2220 and 36561, that added together give a triangular number (38781 = T₂₇₈).

The spelling of 222036561 in words is "two hundred twenty-two million, thirty-six thousand, five hundred sixty-one".