204431040131 has 4 divisors (see below), whose sum is σ = 206728018200. Its totient is φ = 202134062064.

The previous prime is 204431040071. The next prime is 204431040133. The reversal of 204431040131 is 131040134402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204431040131 - 2⁶ = 204431040067 is a prime.

It is a super-2 number, since 2×204431040131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204431040097 and 204431040106.

It is not an unprimeable number, because it can be changed into a prime (204431040133) 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, 1148488901 + ... + 1148489078.

It is an arithmetic number, because the mean of its divisors is an integer number (51682004550).

Almost surely, 2^204431040131 is an apocalyptic number.

204431040131 is a deficient number, since it is larger than the sum of its proper divisors (2296978069).

204431040131 is an equidigital number, since it uses as much as digits as its factorization.

204431040131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296978068.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 204431040131 its reverse (131040134402), we get a palindrome (335471174533).

The spelling of 204431040131 in words is "two hundred four billion, four hundred thirty-one million, forty thousand, one hundred thirty-one".