531213012111 has 16 divisors (see below), whose sum is σ = 723586406400. Its totient is φ = 346495657248.

The previous prime is 531213012067. The next prime is 531213012193. The reversal of 531213012111 is 111210312135.

It is not a de Polignac number, because 531213012111 - 2⁶ = 531213012047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531213019111) 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 15 ways as a sum of consecutive naturals, for example, 164176 + ... + 1043733.

It is an arithmetic number, because the mean of its divisors is an integer number (45224150400).

Almost surely, 2^531213012111 is an apocalyptic number.

531213012111 is a deficient number, since it is larger than the sum of its proper divisors (192373394289).

531213012111 is a wasteful number, since it uses less digits than its factorization.

531213012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211078.

The product of its (nonzero) digits is 180, while the sum is 21.

Adding to 531213012111 its reverse (111210312135), we get a palindrome (642423324246).

The spelling of 531213012111 in words is "five hundred thirty-one billion, two hundred thirteen million, twelve thousand, one hundred eleven".