9999000025 has 27 divisors (see below), whose sum is σ = 14428097469. Its totient is φ = 6854057280.

The previous prime is 9999000001. The next prime is 9999000029. The reversal of 9999000025 is 5200009999.

The square root of 9999000025 is 99995.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 12595401 + 9986404624 = 3549^2 + 99932^2 .

It is not a de Polignac number, because 9999000025 - 2⁷ = 9998999897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999000029) 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 26 ways as a sum of consecutive naturals, for example, 3498397 + ... + 3501253.

Almost surely, 2^9999000025 is an apocalyptic number.

9999000025 is the 99995-th square number.

9999000025 is the 49998-th centered octagonal number.

It is an amenable number.

9999000025 is a deficient number, since it is larger than the sum of its proper divisors (4429097444).

9999000025 is an frugal number, since it uses more digits than its factorization.

9999000025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5738 (or 2869 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 43.

The cubic root of 9999000025 is about 2154.3628749437.

The spelling of 9999000025 in words is "nine billion, nine hundred ninety-nine million, twenty-five", and thus it is an aban number.