12145204090009 has 3 divisors (see below), whose sum is σ = 12145207575007. Its totient is φ = 12145200605012.

The previous prime is 12145204090001. The next prime is 12145204090021. The reversal of 12145204090009 is 90009040254121.

The square root of 12145204090009 is 3484997.

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

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 can be written as a sum of positive squares in only one way, i.e., 901066070025 + 11244138019984 = 949245^2 + 3353228^2 .

It is not a de Polignac number, because 12145204090009 - 2³ = 12145204090001 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 12145204090009.

It is not an unprimeable number, because it can be changed into a prime (12145204090001) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1742499 + ... + 5227495.

Almost surely, 2^{12145204090009} is an apocalyptic number.

12145204090009 is the 3484997-th square number.

12145204090009 is the 1742499-th centered octagonal number.

It is an amenable number.

12145204090009 is a deficient number, since it is larger than the sum of its proper divisors (3484998).

12145204090009 is an frugal number, since it uses more digits than its factorization.

12145204090009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6969994 (or 3484997 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 12145204090009 in words is "twelve trillion, one hundred forty-five billion, two hundred four million, ninety thousand, nine".