999497925 has 18 divisors (see below), whose sum is σ = 1790212242. Its totient is φ = 533065440.

The previous prime is 999497921. The next prime is 999497951. The reversal of 999497925 is 529794999.

It can be written as a sum of positive squares in 3 ways, for example, as 153735201 + 845762724 = 12399^2 + 29082^2 .

It is not a de Polignac number, because 999497925 - 2² = 999497921 is a prime.

It is a super-3 number, since 3×999497925³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999497921) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2220882 + ... + 2221331.

Almost surely, 2^999497925 is an apocalyptic number.

It is an amenable number.

999497925 is a deficient number, since it is larger than the sum of its proper divisors (790714317).

999497925 is a wasteful number, since it uses less digits than its factorization.

999497925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4442229 (or 4442221 counting only the distinct ones).

The product of its digits is 16533720, while the sum is 63.

The square root of 999497925 is about 31614.8371022215. The cubic root of 999497925 is about 999.8326136500.

The spelling of 999497925 in words is "nine hundred ninety-nine million, four hundred ninety-seven thousand, nine hundred twenty-five".