212331309 has 8 divisors (see below), whose sum is σ = 299761920. Its totient is φ = 133227456.

The previous prime is 212331293. The next prime is 212331313. The reversal of 212331309 is 903133212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212331309 - 2⁴ = 212331293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212331349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2081629 + ... + 2081730.

It is an arithmetic number, because the mean of its divisors is an integer number (37470240).

Almost surely, 2^212331309 is an apocalyptic number.

It is an amenable number.

212331309 is a deficient number, since it is larger than the sum of its proper divisors (87430611).

212331309 is a wasteful number, since it uses less digits than its factorization.

212331309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163379.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 212331309 is about 14571.5925347918. The cubic root of 212331309 is about 596.5836483784.

The spelling of 212331309 in words is "two hundred twelve million, three hundred thirty-one thousand, three hundred nine".