1817198449 has 6 divisors (see below), whose sum is σ = 1997416610. Its totient is φ = 1651998480.

The previous prime is 1817198429. The next prime is 1817198473. The reversal of 1817198449 is 9448917181.

It can be written as a sum of positive squares in only one way, i.e., 973876849 + 843321600 = 31207^2 + 29040^2 .

It is not a de Polignac number, because 1817198449 - 2¹⁷ = 1817067377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1817198396 and 1817198405.

It is not an unprimeable number, because it can be changed into a prime (1817198419) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7508964 + ... + 7509205.

Almost surely, 2^1817198449 is an apocalyptic number.

It is an amenable number.

1817198449 is a deficient number, since it is larger than the sum of its proper divisors (180218161).

1817198449 is a wasteful number, since it uses less digits than its factorization.

1817198449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15018191 (or 15018180 counting only the distinct ones).

The product of its digits is 580608, while the sum is 52.

The square root of 1817198449 is about 42628.6106857824. The cubic root of 1817198449 is about 1220.3023636928.

The spelling of 1817198449 in words is "one billion, eight hundred seventeen million, one hundred ninety-eight thousand, four hundred forty-nine".