213781589 has 4 divisors (see below), whose sum is σ = 244321824. Its totient is φ = 183241356.

The previous prime is 213781571. The next prime is 213781643. The reversal of 213781589 is 985187312.

213781589 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213781589 - 2¹⁶ = 213716053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213781289) 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, 15270107 + ... + 15270120.

It is an arithmetic number, because the mean of its divisors is an integer number (61080456).

Almost surely, 2^213781589 is an apocalyptic number.

It is an amenable number.

213781589 is a deficient number, since it is larger than the sum of its proper divisors (30540235).

213781589 is an equidigital number, since it uses as much as digits as its factorization.

213781589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30540234.

The product of its digits is 120960, while the sum is 44.

The square root of 213781589 is about 14621.2717983081. The cubic root of 213781589 is about 597.9388432367.

The spelling of 213781589 in words is "two hundred thirteen million, seven hundred eighty-one thousand, five hundred eighty-nine".