12219754849 has 3 divisors (see below), whose sum is σ = 12219865393. Its totient is φ = 12219644306.

The previous prime is 12219754793. The next prime is 12219754903. The reversal of 12219754849 is 94845791221.

The square root of 12219754849 is 110543.

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: 94845791221 = 41 ⋅2313311981.

It is not a de Polignac number, because 12219754849 - 2¹³ = 12219746657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12219754796 and 12219754805.

It is not an unprimeable number, because it can be changed into a prime (12219754949) 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, 55272 + ... + 165814.

Almost surely, 2^12219754849 is an apocalyptic number.

12219754849 is the 110543-rd square number.

12219754849 is the 55272-nd centered octagonal number.

It is an amenable number.

12219754849 is a deficient number, since it is larger than the sum of its proper divisors (110544).

12219754849 is an frugal number, since it uses more digits than its factorization.

12219754849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221086 (or 110543 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 52.

The spelling of 12219754849 in words is "twelve billion, two hundred nineteen million, seven hundred fifty-four thousand, eight hundred forty-nine".