203130509 has 2 divisors, whose sum is σ = 203130510. Its totient is φ = 203130508.

The previous prime is 203130479. The next prime is 203130563. The reversal of 203130509 is 905031302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200137609 + 2992900 = 14147^2 + 1730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203130509 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 (203130589) 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, 101565254 + 101565255.

It is an arithmetic number, because the mean of its divisors is an integer number (101565255).

Almost surely, 2^203130509 is an apocalyptic number.

It is an amenable number.

203130509 is a deficient number, since it is larger than the sum of its proper divisors (1).

203130509 is an equidigital number, since it uses as much as digits as its factorization.

203130509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 203130509 is about 14252.3860809340. The cubic root of 203130509 is about 587.8389861397.

The spelling of 203130509 in words is "two hundred three million, one hundred thirty thousand, five hundred nine".