1020255209 has 2 divisors, whose sum is σ = 1020255210. Its totient is φ = 1020255208.

The previous prime is 1020255143. The next prime is 1020255211. The reversal of 1020255209 is 9025520201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 903182809 + 117072400 = 30053^2 + 10820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020255209 is a prime.

Together with 1020255211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1020255809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510127604 + 510127605.

It is an arithmetic number, because the mean of its divisors is an integer number (510127605).

Almost surely, 2^1020255209 is an apocalyptic number.

It is an amenable number.

1020255209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020255209 is an equidigital number, since it uses as much as digits as its factorization.

1020255209 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 1020255209 is about 31941.4340473311. The cubic root of 1020255209 is about 1006.7066565380.

The spelling of 1020255209 in words is "one billion, twenty million, two hundred fifty-five thousand, two hundred nine".