1819105025 has 6 divisors (see below), whose sum is σ = 2255690262. Its totient is φ = 1455284000.

The previous prime is 1819105021. The next prime is 1819105027. The reversal of 1819105025 is 5205019181.

It can be written as a sum of positive squares in 3 ways, for example, as 589129984 + 1229975041 = 24272^2 + 35071^2 .

It is not a de Polignac number, because 1819105025 - 2² = 1819105021 is a prime.

It is a super-3 number, since 3×1819105025³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1819104982 and 1819105000.

It is not an unprimeable number, because it can be changed into a prime (1819105021) 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, 36382076 + ... + 36382125.

It is an arithmetic number, because the mean of its divisors is an integer number (375948377).

Almost surely, 2^1819105025 is an apocalyptic number.

It is an amenable number.

1819105025 is a deficient number, since it is larger than the sum of its proper divisors (436585237).

1819105025 is an equidigital number, since it uses as much as digits as its factorization.

1819105025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72764211 (or 72764206 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 32.

The square root of 1819105025 is about 42650.9674567881. The cubic root of 1819105025 is about 1220.7289885335.

The spelling of 1819105025 in words is "one billion, eight hundred nineteen million, one hundred five thousand, twenty-five".