818615449 has 4 divisors (see below), whose sum is σ = 818830260. Its totient is φ = 818400640.

The previous prime is 818615429. The next prime is 818615461. The reversal of 818615449 is 944516818.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 221057424 + 597558025 = 14868^2 + 24445^2 .

It is a cyclic number.

It is not a de Polignac number, because 818615449 - 2¹⁷ = 818484377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 818615399 and 818615408.

It is not an unprimeable number, because it can be changed into a prime (818615429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101584 + ... + 109345.

It is an arithmetic number, because the mean of its divisors is an integer number (204707565).

Almost surely, 2^818615449 is an apocalyptic number.

It is an amenable number.

818615449 is a deficient number, since it is larger than the sum of its proper divisors (214811).

818615449 is a wasteful number, since it uses less digits than its factorization.

818615449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214810.

The product of its digits is 276480, while the sum is 46.

The square root of 818615449 is about 28611.4566039550. The cubic root of 818615449 is about 935.4630663057.

The spelling of 818615449 in words is "eight hundred eighteen million, six hundred fifteen thousand, four hundred forty-nine".