219055981 has 8 divisors (see below), whose sum is σ = 220149504.
Its totient is φ = 217966080.
The previous prime is 219055961. The next prime is 219056003. The reversal of 219055981 is 189550912.
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 2k-219055981 is a prime.
It is a super-2 number, since 2×2190559812 = 95971045623744722, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (219055961) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341421 + ... + 342061.
It is an arithmetic number, because the mean of its divisors is an integer number (27518688).
Almost surely, 2219055981 is an apocalyptic number.
It is an amenable number.
219055981 is a deficient number, since it is larger than the sum of its proper divisors (1093523).
219055981 is an equidigital number, since it uses as much as digits as its factorization.
219055981 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1811.
The product of its (nonzero) digits is 32400, while the sum is 40.
The square root of 219055981 is about 14800.5398888014.
The cubic root of 219055981 is about 602.8163714390.
The spelling of 219055981 in words is "two hundred nineteen million, fifty-five thousand, nine hundred eighty-one".