203431505201 has 4 divisors (see below), whose sum is σ = 203884582500. Its totient is φ = 202978427904.

The previous prime is 203431505183. The next prime is 203431505209. The reversal of 203431505201 is 102505134302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102505134302 = 2 ⋅51252567151.

It can be written as a sum of positive squares in 2 ways, for example, as 120256368400 + 83175136801 = 346780^2 + 288401^2 .

It is a cyclic number.

It is not a de Polignac number, because 203431505201 - 2¹⁴ = 203431488817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203431505209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226537976 + ... + 226538873.

It is an arithmetic number, because the mean of its divisors is an integer number (50971145625).

Almost surely, 2^203431505201 is an apocalyptic number.

It is an amenable number.

203431505201 is a deficient number, since it is larger than the sum of its proper divisors (453077299).

203431505201 is an equidigital number, since it uses as much as digits as its factorization.

203431505201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453077298.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 203431505201 its reverse (102505134302), we get a palindrome (305936639503).

The spelling of 203431505201 in words is "two hundred three billion, four hundred thirty-one million, five hundred five thousand, two hundred one".