212444609 has 4 divisors (see below), whose sum is σ = 228786516. Its totient is φ = 196102704.

The previous prime is 212444593. The next prime is 212444621. The reversal of 212444609 is 906444212.

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 61277584 + 151167025 = 7828^2 + 12295^2 .

It is a cyclic number.

It is not a de Polignac number, because 212444609 - 2⁴ = 212444593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212444669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8170934 + ... + 8170959.

It is an arithmetic number, because the mean of its divisors is an integer number (57196629).

Almost surely, 2^212444609 is an apocalyptic number.

It is an amenable number.

212444609 is a deficient number, since it is larger than the sum of its proper divisors (16341907).

212444609 is a wasteful number, since it uses less digits than its factorization.

212444609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16341906.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 212444609 is about 14575.4797176628. The cubic root of 212444609 is about 596.6897418677.

The spelling of 212444609 in words is "two hundred twelve million, four hundred forty-four thousand, six hundred nine".