203138813 has 2 divisors, whose sum is σ = 203138814. Its totient is φ = 203138812.

The previous prime is 203138759. The next prime is 203138827. The reversal of 203138813 is 318831302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191490244 + 11648569 = 13838^2 + 3413^2 .

It is a cyclic number.

It is not a de Polignac number, because 203138813 - 2¹⁰ = 203137789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203137813) 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, 101569406 + 101569407.

It is an arithmetic number, because the mean of its divisors is an integer number (101569407).

Almost surely, 2^203138813 is an apocalyptic number.

It is an amenable number.

203138813 is a deficient number, since it is larger than the sum of its proper divisors (1).

203138813 is an equidigital number, since it uses as much as digits as its factorization.

203138813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 203138813 is about 14252.6773975980. The cubic root of 203138813 is about 587.8469963404.

The spelling of 203138813 in words is "two hundred three million, one hundred thirty-eight thousand, eight hundred thirteen".