13408018849 has 3 divisors (see below), whose sum is σ = 13408134643. Its totient is φ = 13407903056.

The previous prime is 13408018837. The next prime is 13408018867. The reversal of 13408018849 is 94881080431.

The square root of 13408018849 is 115793.

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: 94881080431 = 223 ⋅425475697.

It can be written as a sum of positive squares in only one way, i.e., 52056225 + 13355962624 = 7215^2 + 115568^2 .

It is not a de Polignac number, because 13408018849 - 2⁷ = 13408018721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13408018799 and 13408018808.

It is not an unprimeable number, because it can be changed into a prime (13408018049) 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, 57897 + ... + 173689.

Almost surely, 2^13408018849 is an apocalyptic number.

13408018849 is the 115793-rd square number.

13408018849 is the 57897-th centered octagonal number.

It is an amenable number.

13408018849 is a deficient number, since it is larger than the sum of its proper divisors (115794).

13408018849 is an frugal number, since it uses more digits than its factorization.

13408018849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231586 (or 115793 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 13408018849 in words is "thirteen billion, four hundred eight million, eighteen thousand, eight hundred forty-nine".