203431121 has 2 divisors, whose sum is σ = 203431122.
Its totient is φ = 203431120.
The previous prime is 203431103. The next prime is 203431139. The reversal of 203431121 is 121134302.
It is a balanced prime because it is at equal distance from previous prime (203431103) and next prime (203431139).
It can be written as a sum of positive squares in only one way, i.e., 203347600 + 83521 = 14260^2 + 289^2
It is a cyclic number.
It is not a de Polignac number, because 203431121 - 26 = 203431057 is a prime.
It is a Sophie Germain prime.
It is a Curzon number.
It is a self number, because there is not a number n which added to its sum of digits gives 203431121.
It is not a weakly prime, because it can be changed into another prime (203431421) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101715560 + 101715561.
It is an arithmetic number, because the mean of its divisors is an integer number (101715561).
Almost surely, 2203431121 is an apocalyptic number.
It is an amenable number.
203431121 is a deficient number, since it is larger than the sum of its proper divisors (1).
203431121 is an equidigital number, since it uses as much as digits as its factorization.
203431121 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 144, while the sum is 17.
The square root of 203431121 is about 14262.9282056666.
The cubic root of 203431121 is about 588.1288233717.
Adding to 203431121 its reverse (121134302), we get a palindrome (324565423).
The spelling of 203431121 in words is "two hundred three million, four hundred thirty-one thousand, one hundred twenty-one".