12542509081 has 4 divisors (see below), whose sum is σ = 12601952464. Its totient is φ = 12483065700.

The previous prime is 12542509079. The next prime is 12542509093. The reversal of 12542509081 is 18090524521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12542509081 - 2¹ = 12542509079 is a prime.

It is a super-2 number, since 2×12542509081² (a number of 21 digits) contains 22 as substring.

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 12542509081.

It is not an unprimeable number, because it can be changed into a prime (12542503081) 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, 29721375 + ... + 29721796.

It is an arithmetic number, because the mean of its divisors is an integer number (3150488116).

Almost surely, 2^12542509081 is an apocalyptic number.

It is an amenable number.

12542509081 is a deficient number, since it is larger than the sum of its proper divisors (59443383).

12542509081 is an equidigital number, since it uses as much as digits as its factorization.

12542509081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59443382.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 12542509081 in words is "twelve billion, five hundred forty-two million, five hundred nine thousand, eighty-one".