1819449025 has 27 divisors (see below), whose sum is σ = 2386424361. Its totient is φ = 1375879680.

The previous prime is 1819448999. The next prime is 1819449061. The reversal of 1819449025 is 5209449181.

The square root of 1819449025 is 42655.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1620529 + 1817828496 = 1273^2 + 42636^2 .

It is not a de Polignac number, because 1819449025 - 2¹¹ = 1819446977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4052001 + ... + 4052449.

Almost surely, 2^1819449025 is an apocalyptic number.

1819449025 is the 42655-th square number.

1819449025 is the 21328-th centered octagonal number.

It is an amenable number.

1819449025 is a deficient number, since it is larger than the sum of its proper divisors (566975336).

1819449025 is an frugal number, since it uses more digits than its factorization.

1819449025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The cubic root of 1819449025 is about 1220.8059319203.

It can be divided in two parts, 181944 and 9025, that added together give a square (190969 = 437²).

The spelling of 1819449025 in words is "one billion, eight hundred nineteen million, four hundred forty-nine thousand, twenty-five".