12531637843 has 4 divisors (see below), whose sum is σ = 12532696648. Its totient is φ = 12530579040.

The previous prime is 12531637813. The next prime is 12531637889. The reversal of 12531637843 is 34873613521.

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 12531637843 - 2²¹ = 12529540691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12531637843.

It is not an unprimeable number, because it can be changed into a prime (12531637813) 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, 511446 + ... + 535387.

It is an arithmetic number, because the mean of its divisors is an integer number (3133174162).

Almost surely, 2^12531637843 is an apocalyptic number.

12531637843 is a deficient number, since it is larger than the sum of its proper divisors (1058805).

12531637843 is a wasteful number, since it uses less digits than its factorization.

12531637843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058804.

The product of its digits is 362880, while the sum is 43.

The spelling of 12531637843 in words is "twelve billion, five hundred thirty-one million, six hundred thirty-seven thousand, eight hundred forty-three".