12541515389 has 4 divisors (see below), whose sum is σ = 13506247356. Its totient is φ = 11576783424.

The previous prime is 12541515377. The next prime is 12541515431. The reversal of 12541515389 is 98351514521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98351514521 = 13 ⋅7565501117.

It can be written as a sum of positive squares in 2 ways, for example, as 678602500 + 11862912889 = 26050^2 + 108917^2 .

It is a cyclic number.

It is not a de Polignac number, because 12541515389 - 2⁴ = 12541515373 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12541515089) 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, 482365964 + ... + 482365989.

It is an arithmetic number, because the mean of its divisors is an integer number (3376561839).

Almost surely, 2^12541515389 is an apocalyptic number.

It is an amenable number.

12541515389 is a deficient number, since it is larger than the sum of its proper divisors (964731967).

12541515389 is an equidigital number, since it uses as much as digits as its factorization.

12541515389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964731966.

The product of its digits is 216000, while the sum is 44.

The spelling of 12541515389 in words is "twelve billion, five hundred forty-one million, five hundred fifteen thousand, three hundred eighty-nine".