210450509 has 2 divisors, whose sum is σ = 210450510. Its totient is φ = 210450508.

The previous prime is 210450491. The next prime is 210450511. The reversal of 210450509 is 905054012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129846025 + 80604484 = 11395^2 + 8978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210450509 is a prime.

Together with 210450511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210450589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105225254 + 105225255.

It is an arithmetic number, because the mean of its divisors is an integer number (105225255).

Almost surely, 2^210450509 is an apocalyptic number.

It is an amenable number.

210450509 is a deficient number, since it is larger than the sum of its proper divisors (1).

210450509 is an equidigital number, since it uses as much as digits as its factorization.

210450509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 210450509 is about 14506.9124557915. The cubic root of 210450509 is about 594.8169377752.

It can be divided in two parts, 210 and 450509, that multiplied together give a triangular number (94606890 = T₁₃₇₅₅).

The spelling of 210450509 in words is "two hundred ten million, four hundred fifty thousand, five hundred nine".