123543531 has 6 divisors (see below), whose sum is σ = 178451780. Its totient is φ = 82362348.

The previous prime is 123543527. The next prime is 123543533. The reversal of 123543531 is 135345321.

123543531 is a `hidden beast` number, since 123 + 5 + 4 + 3 + 531 = 666.

It is not a de Polignac number, because 123543531 - 2² = 123543527 is a prime.

It is a super-2 number, since 2×123543531² = 30526008103895922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123543495 and 123543504.

It is not an unprimeable number, because it can be changed into a prime (123543533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6863521 + ... + 6863538.

Almost surely, 2^123543531 is an apocalyptic number.

123543531 is a deficient number, since it is larger than the sum of its proper divisors (54908249).

123543531 is a wasteful number, since it uses less digits than its factorization.

123543531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13727065 (or 13727062 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 123543531 is about 11115.0137651737. The cubic root of 123543531 is about 498.0504497204.

Adding to 123543531 its reverse (135345321), we get a palindrome (258888852).

The spelling of 123543531 in words is "one hundred twenty-three million, five hundred forty-three thousand, five hundred thirty-one".