1815356449 has 9 divisors (see below), whose sum is σ = 1834602931. Its totient is φ = 1796311120.

The previous prime is 1815356447. The next prime is 1815356461. The reversal of 1815356449 is 9446535181.

The square root of 1815356449 is 42607.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1066349025 + 749007424 = 32655^2 + 27368^2 .

It is not a de Polignac number, because 1815356449 - 2¹ = 1815356447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1815356399 and 1815356408.

It is not an unprimeable number, because it can be changed into a prime (1815356447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5837004 + ... + 5837314.

Almost surely, 2^1815356449 is an apocalyptic number.

1815356449 is the 42607-th square number.

1815356449 is the 21304-th centered octagonal number.

It is an amenable number.

1815356449 is a deficient number, since it is larger than the sum of its proper divisors (19246482).

1815356449 is an frugal number, since it uses more digits than its factorization.

1815356449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896 (or 448 counting only the distinct ones).

The product of its digits is 518400, while the sum is 46.

The cubic root of 1815356449 is about 1219.8899051865.

Multiplying 1815356449 by its product of digits (518400), we get a square (941080783161600 = 30677040²).

The spelling of 1815356449 in words is "one billion, eight hundred fifteen million, three hundred fifty-six thousand, four hundred forty-nine".