909999225 has 48 divisors (see below), whose sum is σ = 1675210240. Its totient is φ = 484315200.

The previous prime is 909999217. The next prime is 909999227. The reversal of 909999225 is 522999909.

It is not a de Polignac number, because 909999225 - 2³ = 909999217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (909999227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 408615 + ... + 410835.

Almost surely, 2^909999225 is an apocalyptic number.

It is an amenable number.

909999225 is a deficient number, since it is larger than the sum of its proper divisors (765211015).

909999225 is a wasteful number, since it uses less digits than its factorization.

909999225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2847 (or 2836 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 54.

The square root of 909999225 is about 30166.1934124941. The cubic root of 909999225 is about 969.0518332461.

The spelling of 909999225 in words is "nine hundred nine million, nine hundred ninety-nine thousand, two hundred twenty-five".