219438981 has 6 divisors (see below), whose sum is σ = 316967430. Its totient is φ = 146292648.

The previous prime is 219438953. The next prime is 219438991. The reversal of 219438981 is 189834912.

219438981 is a `hidden beast` number, since 2 + 194 + 389 + 81 = 666.

219438981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 218034756 + 1404225 = 14766^2 + 1185^2 .

It is not a de Polignac number, because 219438981 - 2¹⁰ = 219437957 is a prime.

It is a super-2 number, since 2×219438981² = 96306932764636722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219438991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12191046 + ... + 12191063.

It is an arithmetic number, because the mean of its divisors is an integer number (52827905).

Almost surely, 2^219438981 is an apocalyptic number.

It is an amenable number.

219438981 is a deficient number, since it is larger than the sum of its proper divisors (97528449).

219438981 is a wasteful number, since it uses less digits than its factorization.

219438981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24382115 (or 24382112 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 219438981 is about 14813.4729553876. The cubic root of 219438981 is about 603.1674905803.

The spelling of 219438981 in words is "two hundred nineteen million, four hundred thirty-eight thousand, nine hundred eighty-one".