1815499225 has 12 divisors (see below), whose sum is σ = 2255746000. Its totient is φ = 1449478800.

The previous prime is 1815499219. The next prime is 1815499243. The reversal of 1815499225 is 5229945181.

It is a happy number.

It is not a de Polignac number, because 1815499225 - 2⁵ = 1815499193 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60291 + ... + 85240.

Almost surely, 2^1815499225 is an apocalyptic number.

It is an amenable number.

1815499225 is a deficient number, since it is larger than the sum of its proper divisors (440246775).

1815499225 is a wasteful number, since it uses less digits than its factorization.

1815499225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146040 (or 146035 counting only the distinct ones).

The product of its digits is 259200, while the sum is 46.

The square root of 1815499225 is about 42608.6754663883. The cubic root of 1815499225 is about 1219.9218853954.

The spelling of 1815499225 in words is "one billion, eight hundred fifteen million, four hundred ninety-nine thousand, two hundred twenty-five".