222601561 has 18 divisors (see below), whose sum is σ = 280406142. Its totient is φ = 176117760.

The previous prime is 222601559. The next prime is 222601571. The reversal of 222601561 is 165106222.

It can be written as a sum of positive squares in 3 ways, for example, as 4862025 + 217739536 = 2205^2 + 14756^2 .

It is not a de Polignac number, because 222601561 - 2¹ = 222601559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222601571) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5160 + ... + 21721.

It is an arithmetic number, because the mean of its divisors is an integer number (15578119).

Almost surely, 2^222601561 is an apocalyptic number.

It is an amenable number.

222601561 is a deficient number, since it is larger than the sum of its proper divisors (57804581).

222601561 is a wasteful number, since it uses less digits than its factorization.

222601561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26921 (or 26901 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 222601561 is about 14919.8378342394. The cubic root of 222601561 is about 606.0513205056.

Adding to 222601561 its reverse (165106222), we get a palindrome (387707783).

The spelling of 222601561 in words is "two hundred twenty-two million, six hundred one thousand, five hundred sixty-one".