213442189 has 4 divisors (see below), whose sum is σ = 215555580. Its totient is φ = 211328800.

The previous prime is 213442171. The next prime is 213442217. The reversal of 213442189 is 981244312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 162562500 + 50879689 = 12750^2 + 7133^2 .

It is a cyclic number.

It is not a de Polignac number, because 213442189 - 2⁹ = 213441677 is a prime.

It is a super-2 number, since 2×213442189² = 91115136090223442, 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 (213443189) 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, 1056544 + ... + 1056745.

It is an arithmetic number, because the mean of its divisors is an integer number (53888895).

Almost surely, 2^213442189 is an apocalyptic number.

It is an amenable number.

213442189 is a deficient number, since it is larger than the sum of its proper divisors (2113391).

213442189 is a wasteful number, since it uses less digits than its factorization.

213442189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113390.

The product of its digits is 13824, while the sum is 34.

The square root of 213442189 is about 14609.6608105733. The cubic root of 213442189 is about 597.6222460726.

The spelling of 213442189 in words is "two hundred thirteen million, four hundred forty-two thousand, one hundred eighty-nine".