212310509 has 2 divisors, whose sum is σ = 212310510. Its totient is φ = 212310508.

The previous prime is 212310457. The next prime is 212310533. The reversal of 212310509 is 905013212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154504900 + 57805609 = 12430^2 + 7603^2 .

It is a cyclic number.

It is not a de Polignac number, because 212310509 - 2⁸ = 212310253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212310559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106155254 + 106155255.

It is an arithmetic number, because the mean of its divisors is an integer number (106155255).

Almost surely, 2^212310509 is an apocalyptic number.

It is an amenable number.

212310509 is a deficient number, since it is larger than the sum of its proper divisors (1).

212310509 is an equidigital number, since it uses as much as digits as its factorization.

212310509 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 23.

The square root of 212310509 is about 14570.8787998528. The cubic root of 212310509 is about 596.5641672742.

The spelling of 212310509 in words is "two hundred twelve million, three hundred ten thousand, five hundred nine".