997907096209 has 9 divisors (see below), whose sum is σ = 999914023017. Its totient is φ = 995904195444.

The previous prime is 997907096201. The next prime is 997907096269. The reversal of 997907096209 is 902690709799.

The square root of 997907096209 is 998953.

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

It is not a de Polignac number, because 997907096209 - 2³ = 997907096201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997907096201) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 918037264 + ... + 918038350.

It is an arithmetic number, because the mean of its divisors is an integer number (111101558113).

Almost surely, 2^997907096209 is an apocalyptic number.

997907096209 is the 998953-rd square number.

997907096209 is the 499477-th centered octagonal number.

It is an amenable number.

997907096209 is a deficient number, since it is larger than the sum of its proper divisors (2006926808).

997907096209 is an frugal number, since it uses more digits than its factorization.

997907096209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4012 (or 2006 counting only the distinct ones).

The product of its (nonzero) digits is 34720812, while the sum is 67.

The spelling of 997907096209 in words is "nine hundred ninety-seven billion, nine hundred seven million, ninety-six thousand, two hundred nine".