219561841 has 4 divisors (see below), whose sum is σ = 229108032. Its totient is φ = 210015652.

The previous prime is 219561829. The next prime is 219561877. The reversal of 219561841 is 148165912.

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 219561841 - 2¹⁷ = 219430769 is a prime.

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 219561841.

It is not an unprimeable number, because it can be changed into a prime (219561241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4773061 + ... + 4773106.

It is an arithmetic number, because the mean of its divisors is an integer number (57277008).

Almost surely, 2^219561841 is an apocalyptic number.

It is an amenable number.

219561841 is a deficient number, since it is larger than the sum of its proper divisors (9546191).

219561841 is an equidigital number, since it uses as much as digits as its factorization.

219561841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9546190.

The product of its digits is 17280, while the sum is 37.

The square root of 219561841 is about 14817.6192757136. The cubic root of 219561841 is about 603.2800371780.

The spelling of 219561841 in words is "two hundred nineteen million, five hundred sixty-one thousand, eight hundred forty-one".