531020430511 has 4 divisors (see below), whose sum is σ = 531326849112. Its totient is φ = 530714011912.

The previous prime is 531020430467. The next prime is 531020430533. The reversal of 531020430511 is 115034020135.

It is a happy number.

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 531020430511 - 2³³ = 522430495919 is a prime.

It is a super-2 number, since 2×531020430511² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531020431511) 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, 153206701 + ... + 153210166.

It is an arithmetic number, because the mean of its divisors is an integer number (132831712278).

Almost surely, 2^531020430511 is an apocalyptic number.

531020430511 is a deficient number, since it is larger than the sum of its proper divisors (306418601).

531020430511 is a wasteful number, since it uses less digits than its factorization.

531020430511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306418600.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 531020430511 its reverse (115034020135), we get a palindrome (646054450646).

The spelling of 531020430511 in words is "five hundred thirty-one billion, twenty million, four hundred thirty thousand, five hundred eleven".