203444404013 has 4 divisors (see below), whose sum is σ = 203461203360. Its totient is φ = 203427604668.

The previous prime is 203444403991. The next prime is 203444404057. The reversal of 203444404013 is 310404444302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203444404013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203444403013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8381495 + ... + 8405732.

It is an arithmetic number, because the mean of its divisors is an integer number (50865300840).

Almost surely, 2^203444404013 is an apocalyptic number.

It is an amenable number.

203444404013 is a deficient number, since it is larger than the sum of its proper divisors (16799347).

203444404013 is a wasteful number, since it uses less digits than its factorization.

203444404013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16799346.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 203444404013 its reverse (310404444302), we get a palindrome (513848848315).

The spelling of 203444404013 in words is "two hundred three billion, four hundred forty-four million, four hundred four thousand, thirteen".