12261543531 has 4 divisors (see below), whose sum is σ = 16348724712. Its totient is φ = 8174362352.

The previous prime is 12261543529. The next prime is 12261543559. The reversal of 12261543531 is 13534516221.

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 12261543531 - 2¹ = 12261543529 is a prime.

It is a super-2 number, since 2×12261543531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12261543492 and 12261543501.

It is not an unprimeable number, because it can be changed into a prime (12261547531) 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 3 ways as a sum of consecutive naturals, for example, 2043590586 + ... + 2043590591.

It is an arithmetic number, because the mean of its divisors is an integer number (4087181178).

Almost surely, 2^12261543531 is an apocalyptic number.

12261543531 is a deficient number, since it is larger than the sum of its proper divisors (4087181181).

12261543531 is an equidigital number, since it uses as much as digits as its factorization.

12261543531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4087181180.

The product of its digits is 21600, while the sum is 33.

The spelling of 12261543531 in words is "twelve billion, two hundred sixty-one million, five hundred forty-three thousand, five hundred thirty-one".