203104531631 has 4 divisors (see below), whose sum is σ = 210108136200. Its totient is φ = 196100927064.

The previous prime is 203104531627. The next prime is 203104531639. The reversal of 203104531631 is 136135401302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136135401302 = 2 ⋅68067700651.

It is a cyclic number.

It is not a de Polignac number, because 203104531631 - 2² = 203104531627 is a prime.

It is a super-2 number, since 2×203104531631² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 7003604539 = 203104531631 / (2 + 0 + 3 + 1 + 0 + 4 + 5 + 3 + 1 + 6 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203104531594 and 203104531603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203104531639) 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, 3501802241 + ... + 3501802298.

It is an arithmetic number, because the mean of its divisors is an integer number (52527034050).

Almost surely, 2^203104531631 is an apocalyptic number.

203104531631 is a deficient number, since it is larger than the sum of its proper divisors (7003604569).

203104531631 is an equidigital number, since it uses as much as digits as its factorization.

203104531631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7003604568.

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 203104531631 its reverse (136135401302), we get a palindrome (339239932933).

The spelling of 203104531631 in words is "two hundred three billion, one hundred four million, five hundred thirty-one thousand, six hundred thirty-one".