12359172509 has 4 divisors (see below), whose sum is σ = 12528476316. Its totient is φ = 12189868704.

The previous prime is 12359172461. The next prime is 12359172557. The reversal of 12359172509 is 90527195321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12359172461) and next prime (12359172557).

It can be written as a sum of positive squares in 2 ways, for example, as 6264247609 + 6094924900 = 79147^2 + 78070^2 .

It is a cyclic number.

It is not a de Polignac number, because 12359172509 - 2⁸ = 12359172253 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 12359172509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12359172569) 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, 84651794 + ... + 84651939.

It is an arithmetic number, because the mean of its divisors is an integer number (3132119079).

Almost surely, 2^12359172509 is an apocalyptic number.

It is an amenable number.

12359172509 is a deficient number, since it is larger than the sum of its proper divisors (169303807).

12359172509 is an equidigital number, since it uses as much as digits as its factorization.

12359172509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169303806.

The product of its (nonzero) digits is 170100, while the sum is 44.

The spelling of 12359172509 in words is "twelve billion, three hundred fifty-nine million, one hundred seventy-two thousand, five hundred nine".