212311009 has 8 divisors (see below), whose sum is σ = 214159400. Its totient is φ = 210470400.

The previous prime is 212311003. The next prime is 212311019. The reversal of 212311009 is 900113212.

It can be written as a sum of positive squares in 4 ways, for example, as 19184400 + 193126609 = 4380^2 + 13897^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 212311009 - 2⁷ = 212310881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212311003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61489 + ... + 64849.

It is an arithmetic number, because the mean of its divisors is an integer number (26769925).

Almost surely, 2^212311009 is an apocalyptic number.

It is an amenable number.

212311009 is a deficient number, since it is larger than the sum of its proper divisors (1848391).

212311009 is a wasteful number, since it uses less digits than its factorization.

212311009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3891.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 212311009 is about 14570.8959573528. The cubic root of 212311009 is about 596.5646355849.

The spelling of 212311009 in words is "two hundred twelve million, three hundred eleven thousand, nine".