212064309 has 6 divisors (see below), whose sum is σ = 306315126. Its totient is φ = 141376200.

The previous prime is 212064283. The next prime is 212064311. The reversal of 212064309 is 903460212.

212064309 is a `hidden beast` number, since 2 + 12 + 0 + 643 + 0 + 9 = 666.

212064309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 204347025 + 7717284 = 14295^2 + 2778^2 .

It is not a de Polignac number, because 212064309 - 2⁵ = 212064277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212064379) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11781342 + ... + 11781359.

It is an arithmetic number, because the mean of its divisors is an integer number (51052521).

Almost surely, 2^212064309 is an apocalyptic number.

It is an amenable number.

212064309 is a deficient number, since it is larger than the sum of its proper divisors (94250817).

212064309 is a wasteful number, since it uses less digits than its factorization.

212064309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23562707 (or 23562704 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 212064309 is about 14562.4279912383. The cubic root of 212064309 is about 596.3334817119. Note that the first 3 decimals are identical.

The spelling of 212064309 in words is "two hundred twelve million, sixty-four thousand, three hundred nine".