212231689 has 4 divisors (see below), whose sum is σ = 224715924. Its totient is φ = 199747456.

The previous prime is 212231671. The next prime is 212231693. The reversal of 212231689 is 986132212.

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 149695225 + 62536464 = 12235^2 + 7908^2 .

It is a cyclic number.

It is not a de Polignac number, because 212231689 - 2⁷ = 212231561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212231629) 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, 6242092 + ... + 6242125.

It is an arithmetic number, because the mean of its divisors is an integer number (56178981).

Almost surely, 2^212231689 is an apocalyptic number.

It is an amenable number.

212231689 is a deficient number, since it is larger than the sum of its proper divisors (12484235).

212231689 is a wasteful number, since it uses less digits than its factorization.

212231689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12484234.

The product of its digits is 10368, while the sum is 34.

The square root of 212231689 is about 14568.1738388859. The cubic root of 212231689 is about 596.4903335798.

The spelling of 212231689 in words is "two hundred twelve million, two hundred thirty-one thousand, six hundred eighty-nine".