212003509 has 2 divisors, whose sum is σ = 212003510. Its totient is φ = 212003508.

The previous prime is 212003479. The next prime is 212003563. The reversal of 212003509 is 905300212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187964100 + 24039409 = 13710^2 + 4903^2 .

It is a cyclic number.

It is not a de Polignac number, because 212003509 - 2¹³ = 211995317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212003509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212003569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106001754 + 106001755.

It is an arithmetic number, because the mean of its divisors is an integer number (106001755).

Almost surely, 2^212003509 is an apocalyptic number.

It is an amenable number.

212003509 is a deficient number, since it is larger than the sum of its proper divisors (1).

212003509 is an equidigital number, since it uses as much as digits as its factorization.

212003509 is an odious number, because the sum of its binary digits is odd.

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

The square root of 212003509 is about 14560.3402776171. The cubic root of 212003509 is about 596.2764855717.

The spelling of 212003509 in words is "two hundred twelve million, three thousand, five hundred nine".