531323113531 has 4 divisors (see below), whose sum is σ = 607226415472. Its totient is φ = 455419811592.

The previous prime is 531323113523. The next prime is 531323113553. The reversal of 531323113531 is 135311323135.

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 531323113531 - 2³ = 531323113523 is a prime.

It is a super-2 number, since 2×531323113531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 531323113493 and 531323113502.

It is not an unprimeable number, because it can be changed into a prime (531323113561) 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, 37951650960 + ... + 37951650973.

It is an arithmetic number, because the mean of its divisors is an integer number (151806603868).

Almost surely, 2^531323113531 is an apocalyptic number.

531323113531 is a deficient number, since it is larger than the sum of its proper divisors (75903301941).

531323113531 is an equidigital number, since it uses as much as digits as its factorization.

531323113531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75903301940.

The product of its digits is 12150, while the sum is 31.

Adding to 531323113531 its reverse (135311323135), we get a palindrome (666634436666).

The spelling of 531323113531 in words is "five hundred thirty-one billion, three hundred twenty-three million, one hundred thirteen thousand, five hundred thirty-one".