213443239 has 2 divisors, whose sum is σ = 213443240. Its totient is φ = 213443238.

The previous prime is 213443233. The next prime is 213443249. The reversal of 213443239 is 932344312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213443239 - 2⁹ = 213442727 is a prime.

It is a super-2 number, since 2×213443239² = 91116032549622242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213443239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213443233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106721619 + 106721620.

It is an arithmetic number, because the mean of its divisors is an integer number (106721620).

Almost surely, 2^213443239 is an apocalyptic number.

213443239 is a deficient number, since it is larger than the sum of its proper divisors (1).

213443239 is an equidigital number, since it uses as much as digits as its factorization.

213443239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 31.

The square root of 213443239 is about 14609.6967456549. The cubic root of 213443239 is about 597.6232260449.

The spelling of 213443239 in words is "two hundred thirteen million, four hundred forty-three thousand, two hundred thirty-nine".