999997025 has 12 divisors (see below), whose sum is σ = 1240393452. Its totient is φ = 799741440.

The previous prime is 999997021. The next prime is 999997049. The reversal of 999997025 is 520799999.

It can be written as a sum of positive squares in 6 ways, for example, as 94167616 + 905829409 = 9704^2 + 30097^2 .

It is not a de Polignac number, because 999997025 - 2² = 999997021 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999997021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131117 + ... + 138533.

It is an arithmetic number, because the mean of its divisors is an integer number (103366121).

Almost surely, 2^999997025 is an apocalyptic number.

It is an amenable number.

999997025 is a deficient number, since it is larger than the sum of its proper divisors (240396427).

999997025 is a wasteful number, since it uses less digits than its factorization.

999997025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12820 (or 12815 counting only the distinct ones).

The product of its (nonzero) digits is 4133430, while the sum is 59.

The square root of 999997025 is about 31622.7295627686. The cubic root of 999997025 is about 999.9990083323. Note that the first 3 decimals are identical.

The spelling of 999997025 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, twenty-five".