1817423225 has 6 divisors (see below), whose sum is σ = 2253604830. Its totient is φ = 1453938560.

The previous prime is 1817423221. The next prime is 1817423227. The reversal of 1817423225 is 5223247181.

It can be written as a sum of positive squares in 3 ways, for example, as 125910841 + 1691512384 = 11221^2 + 41128^2 .

It is not a de Polignac number, because 1817423225 - 2² = 1817423221 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1817423221) 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, 36348440 + ... + 36348489.

It is an arithmetic number, because the mean of its divisors is an integer number (375600805).

Almost surely, 2^1817423225 is an apocalyptic number.

It is an amenable number.

1817423225 is a deficient number, since it is larger than the sum of its proper divisors (436181605).

1817423225 is an equidigital number, since it uses as much as digits as its factorization.

1817423225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72696939 (or 72696934 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 1817423225 is about 42631.2470495527. The cubic root of 1817423225 is about 1220.3526761900.

The spelling of 1817423225 in words is "one billion, eight hundred seventeen million, four hundred twenty-three thousand, two hundred twenty-five".