205543004131 has 4 divisors (see below), whose sum is σ = 216361057000. Its totient is φ = 194724951264.

The previous prime is 205543004089. The next prime is 205543004179. The reversal of 205543004131 is 131400345502.

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 205543004131 - 2⁷ = 205543004003 is a prime.

It is a super-2 number, since 2×205543004131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205543004131.

It is not an unprimeable number, because it can be changed into a prime (205543004231) 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, 5409026406 + ... + 5409026443.

It is an arithmetic number, because the mean of its divisors is an integer number (54090264250).

Almost surely, 2^205543004131 is an apocalyptic number.

205543004131 is a deficient number, since it is larger than the sum of its proper divisors (10818052869).

205543004131 is a wasteful number, since it uses less digits than its factorization.

205543004131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10818052868.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 205543004131 its reverse (131400345502), we get a palindrome (336943349633).

The spelling of 205543004131 in words is "two hundred five billion, five hundred forty-three million, four thousand, one hundred thirty-one".