12515120641 has 3 divisors (see below), whose sum is σ = 12515232513. Its totient is φ = 12515008770.

The previous prime is 12515120633. The next prime is 12515120687. The reversal of 12515120641 is 14602151521.

The square root of 12515120641 is 111871.

It is a perfect power (a square), and thus also a powerful number.

12515120641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14602151521 = 739 ⋅19759339.

It is not a de Polignac number, because 12515120641 - 2³ = 12515120633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12515120441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 55936 + ... + 167806.

It is an arithmetic number, because the mean of its divisors is an integer number (4171744171).

Almost surely, 2^12515120641 is an apocalyptic number.

12515120641 is the 111871-st square number.

12515120641 is the 55936-th centered octagonal number.

It is an amenable number.

12515120641 is a deficient number, since it is larger than the sum of its proper divisors (111872).

12515120641 is an frugal number, since it uses more digits than its factorization.

12515120641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223742 (or 111871 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The spelling of 12515120641 in words is "twelve billion, five hundred fifteen million, one hundred twenty thousand, six hundred forty-one".