999217625 has 16 divisors (see below), whose sum is σ = 1425171072. Its totient is φ = 685177200.

The previous prime is 999217573. The next prime is 999217631. The reversal of 999217625 is 526712999.

It is a happy number.

999217625 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 999217625 - 2⁶ = 999217561 is a prime.

It is a super-2 number, since 2×999217625² = 1996871724221281250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 570107 + ... + 571856.

It is an arithmetic number, because the mean of its divisors is an integer number (89073192).

Almost surely, 2^999217625 is an apocalyptic number.

It is an amenable number.

999217625 is a deficient number, since it is larger than the sum of its proper divisors (425953447).

999217625 is a wasteful number, since it uses less digits than its factorization.

999217625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141985 (or 1141975 counting only the distinct ones).

The product of its digits is 612360, while the sum is 50.

The square root of 999217625 is about 31610.4037462352. The cubic root of 999217625 is about 999.7391402915.

The spelling of 999217625 in words is "nine hundred ninety-nine million, two hundred seventeen thousand, six hundred twenty-five".