999809325 has 30 divisors (see below), whose sum is σ = 1851996234. Its totient is φ = 533230560.

The previous prime is 999809323. The next prime is 999809329. The reversal of 999809325 is 523908999.

It can be written as a sum of positive squares in 3 ways, for example, as 118788201 + 881021124 = 10899^2 + 29682^2 .

It is not a de Polignac number, because 999809325 - 2¹ = 999809323 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999809323) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 244842 + ... + 248891.

Almost surely, 2^999809325 is an apocalyptic number.

It is an amenable number.

999809325 is a deficient number, since it is larger than the sum of its proper divisors (852186909).

999809325 is a wasteful number, since it uses less digits than its factorization.

999809325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493755 (or 493741 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The square root of 999809325 is about 31619.7616214923. The cubic root of 999809325 is about 999.9364376266.

It can be divided in two parts, 99 and 9809325, that added together give a square (9809424 = 3132²).

The spelling of 999809325 in words is "nine hundred ninety-nine million, eight hundred nine thousand, three hundred twenty-five".