212516609 has 4 divisors (see below), whose sum is σ = 225017604. Its totient is φ = 200015616.

The previous prime is 212516599. The next prime is 212516617. The reversal of 212516609 is 906615212.

It is a happy number.

212516609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 122323600 + 90193009 = 11060^2 + 9497^2 .

It is a cyclic number.

It is not a de Polignac number, because 212516609 - 2¹⁶ = 212451073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212516209) 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, 6250472 + ... + 6250505.

It is an arithmetic number, because the mean of its divisors is an integer number (56254401).

Almost surely, 2^212516609 is an apocalyptic number.

It is an amenable number.

212516609 is a deficient number, since it is larger than the sum of its proper divisors (12500995).

212516609 is a wasteful number, since it uses less digits than its factorization.

212516609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12500994.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 212516609 is about 14577.9494099822. The cubic root of 212516609 is about 596.7571426663.

The spelling of 212516609 in words is "two hundred twelve million, five hundred sixteen thousand, six hundred nine".