999697925 has 12 divisors (see below), whose sum is σ = 1263016260. Its totient is φ = 784667520.

The previous prime is 999697891. The next prime is 999697961. The reversal of 999697925 is 529796999.

999697925 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 31618²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 78393316 + 921304609 = 8854^2 + 30353^2 .

It is a de Polignac number, because none of the positive numbers 2^k-999697925 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375920 + ... + 378569.

It is an arithmetic number, because the mean of its divisors is an integer number (105251355).

Almost surely, 2^999697925 is an apocalyptic number.

It is an amenable number.

999697925 is a deficient number, since it is larger than the sum of its proper divisors (263318335).

999697925 is a wasteful number, since it uses less digits than its factorization.

999697925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754552 (or 754547 counting only the distinct ones).

The product of its digits is 24800580, while the sum is 65.

The square root of 999697925 is about 31618.0000158138. Note that the first 4 decimals coincide. The cubic root of 999697925 is about 999.8992981928.

The spelling of 999697925 in words is "nine hundred ninety-nine million, six hundred ninety-seven thousand, nine hundred twenty-five".