213123689 has 4 divisors (see below), whose sum is σ = 213382224. Its totient is φ = 212865156.

The previous prime is 213123643. The next prime is 213123787. The reversal of 213123689 is 986321312.

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 213123689 - 2²⁰ = 212075113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213126689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128027 + ... + 129680.

It is an arithmetic number, because the mean of its divisors is an integer number (53345556).

Almost surely, 2^213123689 is an apocalyptic number.

It is an amenable number.

213123689 is a deficient number, since it is larger than the sum of its proper divisors (258535).

213123689 is an equidigital number, since it uses as much as digits as its factorization.

213123689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258534.

The product of its digits is 15552, while the sum is 35.

The square root of 213123689 is about 14598.7564196407. The cubic root of 213123689 is about 597.3248393263.

The spelling of 213123689 in words is "two hundred thirteen million, one hundred twenty-three thousand, six hundred eighty-nine".