220561361 has 4 divisors (see below), whose sum is σ = 220710000. Its totient is φ = 220412724.

The previous prime is 220561339. The next prime is 220561399. The reversal of 220561361 is 163165022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220561361 - 2¹⁴ = 220544977 is a prime.

It is a super-3 number, since 3×220561361³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220561361.

It is not an unprimeable number, because it can be changed into a prime (220563361) 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 in 3 ways as a sum of consecutive naturals, for example, 72071 + ... + 75068.

It is an arithmetic number, because the mean of its divisors is an integer number (55177500).

Almost surely, 2^220561361 is an apocalyptic number.

It is an amenable number.

220561361 is a deficient number, since it is larger than the sum of its proper divisors (148639).

220561361 is a wasteful number, since it uses less digits than its factorization.

220561361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148638.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 220561361 is about 14851.3083935389. The cubic root of 220561361 is about 604.1940966846.

The spelling of 220561361 in words is "two hundred twenty million, five hundred sixty-one thousand, three hundred sixty-one".