531267512161 has 3 divisors (see below), whose sum is σ = 531268241043. Its totient is φ = 531266783280.

The previous prime is 531267512137. The next prime is 531267512203. The reversal of 531267512161 is 161215762135.

It is a happy number.

The square root of 531267512161 is 728881.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 87871337761 + 443396174400 = 296431^2 + 665880^2 .

It is not a de Polignac number, because 531267512161 - 2⁵ = 531267512129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531267512561) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 364441 + ... + 1093321.

It is an arithmetic number, because the mean of its divisors is an integer number (177089413681).

Almost surely, 2^531267512161 is an apocalyptic number.

531267512161 is the 728881-st square number.

531267512161 is the 364441-st centered octagonal number.

It is an amenable number.

531267512161 is a deficient number, since it is larger than the sum of its proper divisors (728882).

531267512161 is an frugal number, since it uses more digits than its factorization.

531267512161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457762 (or 728881 counting only the distinct ones).

The product of its digits is 75600, while the sum is 40.

The spelling of 531267512161 in words is "five hundred thirty-one billion, two hundred sixty-seven million, five hundred twelve thousand, one hundred sixty-one".