203138811 has 6 divisors (see below), whose sum is σ = 293422740. Its totient is φ = 135425868.

The previous prime is 203138759. The next prime is 203138813. The reversal of 203138811 is 118831302.

It is not a de Polignac number, because 203138811 - 2¹⁰ = 203137787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (203138813) 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 in 5 ways as a sum of consecutive naturals, for example, 11285481 + ... + 11285498.

It is an arithmetic number, because the mean of its divisors is an integer number (48903790).

Almost surely, 2^203138811 is an apocalyptic number.

203138811 is a deficient number, since it is larger than the sum of its proper divisors (90283929).

203138811 is a wasteful number, since it uses less digits than its factorization.

203138811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22570985 (or 22570982 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 203138811 is about 14252.6773274357. The cubic root of 203138811 is about 587.8469944112.

The spelling of 203138811 in words is "two hundred three million, one hundred thirty-eight thousand, eight hundred eleven".