213144439 has 4 divisors (see below), whose sum is σ = 214059456. Its totient is φ = 212229424.

The previous prime is 213144433. The next prime is 213144443. The reversal of 213144439 is 934441312.

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

It is a cyclic number.

It is not a de Polignac number, because 213144439 - 2⁷ = 213144311 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 213144439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213144433) 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, 457159 + ... + 457624.

It is an arithmetic number, because the mean of its divisors is an integer number (53514864).

Almost surely, 2^213144439 is an apocalyptic number.

213144439 is a deficient number, since it is larger than the sum of its proper divisors (915017).

213144439 is an equidigital number, since it uses as much as digits as its factorization.

213144439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915016.

The product of its digits is 10368, while the sum is 31.

The square root of 213144439 is about 14599.4670793149. The cubic root of 213144439 is about 597.3442241387.

The spelling of 213144439 in words is "two hundred thirteen million, one hundred forty-four thousand, four hundred thirty-nine".