999508225 has 9 divisors (see below), whose sum is σ = 1239586243. Its totient is φ = 799480120.

The previous prime is 999508219. The next prime is 999508247. The reversal of 999508225 is 522805999.

It is a happy number.

The square root of 999508225 is 31615.

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

It can be written as a sum of positive squares in only one way, i.e., 359822961 + 639685264 = 18969^2 + 25292^2 .

It is not a de Polignac number, because 999508225 - 2¹⁷ = 999377153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 154914 + ... + 161236.

Almost surely, 2^999508225 is an apocalyptic number.

999508225 is the 31615-th square number.

999508225 is the 15808-th centered octagonal number.

It is an amenable number.

999508225 is a deficient number, since it is larger than the sum of its proper divisors (240078018).

999508225 is an frugal number, since it uses more digits than its factorization.

999508225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12656 (or 6328 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 49.

The cubic root of 999508225 is about 999.8360481213.

Multiplying 999508225 by its sum of digits (49), we get a square (48975903025 = 221305²).

The spelling of 999508225 in words is "nine hundred ninety-nine million, five hundred eight thousand, two hundred twenty-five".