531385311811 has 4 divisors (see below), whose sum is σ = 536646552624. Its totient is φ = 526124071000.

The previous prime is 531385311799. The next prime is 531385311817. The reversal of 531385311811 is 118113583135.

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 531385311811 - 2⁷ = 531385311683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531385311817) 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, 2630620255 + ... + 2630620456.

It is an arithmetic number, because the mean of its divisors is an integer number (134161638156).

Almost surely, 2^531385311811 is an apocalyptic number.

531385311811 is a deficient number, since it is larger than the sum of its proper divisors (5261240813).

531385311811 is a wasteful number, since it uses less digits than its factorization.

531385311811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261240812.

The product of its digits is 43200, while the sum is 40.

Adding to 531385311811 its reverse (118113583135), we get a palindrome (649498894946).

The spelling of 531385311811 in words is "five hundred thirty-one billion, three hundred eighty-five million, three hundred eleven thousand, eight hundred eleven".