12509751409 has 3 divisors (see below), whose sum is σ = 12509863257. Its totient is φ = 12509639562.

The previous prime is 12509751389. The next prime is 12509751413. The reversal of 12509751409 is 90415790521.

The square root of 12509751409 is 111847.

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

12509751409 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.

It is not a de Polignac number, because 12509751409 - 2³¹ = 10362267761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12509751109) 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, 55924 + ... + 167770.

It is an arithmetic number, because the mean of its divisors is an integer number (4169954419).

Almost surely, 2^12509751409 is an apocalyptic number.

12509751409 is the 111847-th square number.

12509751409 is the 55924-th centered octagonal number.

It is an amenable number.

12509751409 is a deficient number, since it is larger than the sum of its proper divisors (111848).

12509751409 is an frugal number, since it uses more digits than its factorization.

12509751409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223694 (or 111847 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 12509751409 in words is "twelve billion, five hundred nine million, seven hundred fifty-one thousand, four hundred nine".