12476219809 has 3 divisors (see below), whose sum is σ = 12476331507. Its totient is φ = 12476108112.

The previous prime is 12476219779. The next prime is 12476219813. The reversal of 12476219809 is 90891267421.

The square root of 12476219809 is 111697.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90891267421 = 41 ⋅2216860181.

It can be written as a sum of positive squares in only one way, i.e., 1934680225 + 10541539584 = 43985^2 + 102672^2 .

It is not a de Polignac number, because 12476219809 - 2²⁵ = 12442665377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12476219849) 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, 55849 + ... + 167545.

It is an arithmetic number, because the mean of its divisors is an integer number (4158777169).

Almost surely, 2^12476219809 is an apocalyptic number.

12476219809 is the 111697-th square number.

12476219809 is the 55849-th centered octagonal number.

It is an amenable number.

12476219809 is a deficient number, since it is larger than the sum of its proper divisors (111698).

12476219809 is an frugal number, since it uses more digits than its factorization.

12476219809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223394 (or 111697 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

Multiplying 12476219809 by its sum of digits (49), we get a square (611334770641 = 781879²).

The spelling of 12476219809 in words is "twelve billion, four hundred seventy-six million, two hundred nineteen thousand, eight hundred nine".