212530009 has 4 divisors (see below), whose sum is σ = 219858660. Its totient is φ = 205201360.

The previous prime is 212529973. The next prime is 212530013. The reversal of 212530009 is 900035212.

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 76737600 + 135792409 = 8760^2 + 11653^2 .

It is a cyclic number.

It is not a de Polignac number, because 212530009 - 2¹⁷ = 212398937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212530069) 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, 3664282 + ... + 3664339.

It is an arithmetic number, because the mean of its divisors is an integer number (54964665).

Almost surely, 2^212530009 is an apocalyptic number.

212530009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

212530009 is a deficient number, since it is larger than the sum of its proper divisors (7328651).

212530009 is an equidigital number, since it uses as much as digits as its factorization.

212530009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7328650.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 212530009 is about 14578.4090009850. The cubic root of 212530009 is about 596.7696850235.

The spelling of 212530009 in words is "two hundred twelve million, five hundred thirty thousand, nine".