1009890225 has 18 divisors (see below), whose sum is σ = 1808826006. Its totient is φ = 538608000.

The previous prime is 1009890221. The next prime is 1009890227. The reversal of 1009890225 is 5220989001.

It can be written as a sum of positive squares in 3 ways, for example, as 12341169 + 997549056 = 3513^2 + 31584^2 .

It is not a de Polignac number, because 1009890225 - 2² = 1009890221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1009890225.

It is not an unprimeable number, because it can be changed into a prime (1009890221) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2243976 + ... + 2244425.

Almost surely, 2^1009890225 is an apocalyptic number.

1009890225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1009890225 is a deficient number, since it is larger than the sum of its proper divisors (798935781).

1009890225 is a wasteful number, since it uses less digits than its factorization.

1009890225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4488417 (or 4488409 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1009890225 is about 31778.7700359847. The cubic root of 1009890225 is about 1003.2859324879.

The spelling of 1009890225 in words is "one billion, nine million, eight hundred ninety thousand, two hundred twenty-five".