220381561 has 8 divisors (see below), whose sum is σ = 230316480. Its totient is φ = 210476112.

The previous prime is 220381549. The next prime is 220381597. The reversal of 220381561 is 165183022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220381561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220381501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8695 + ... + 22723.

It is an arithmetic number, because the mean of its divisors is an integer number (28789560).

Almost surely, 2^220381561 is an apocalyptic number.

It is an amenable number.

220381561 is a deficient number, since it is larger than the sum of its proper divisors (9934919).

220381561 is a wasteful number, since it uses less digits than its factorization.

220381561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14735.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 220381561 is about 14845.2538206661. The cubic root of 220381561 is about 604.0298738568.

The spelling of 220381561 in words is "two hundred twenty million, three hundred eighty-one thousand, five hundred sixty-one".