997530309 has 24 divisors (see below), whose sum is σ = 1559218752. Its totient is φ = 636102720.

The previous prime is 997530293. The next prime is 997530319. The reversal of 997530309 is 903035799.

It is not a de Polignac number, because 997530309 - 2⁴ = 997530293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997530319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83652 + ... + 94829.

It is an arithmetic number, because the mean of its divisors is an integer number (64967448).

Almost surely, 2^997530309 is an apocalyptic number.

It is an amenable number.

997530309 is a deficient number, since it is larger than the sum of its proper divisors (561688443).

997530309 is a wasteful number, since it uses less digits than its factorization.

997530309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178519 (or 178507 counting only the distinct ones).

The product of its (nonzero) digits is 229635, while the sum is 45.

The square root of 997530309 is about 31583.7032185904. The cubic root of 997530309 is about 999.1760910271.

The spelling of 997530309 in words is "nine hundred ninety-seven million, five hundred thirty thousand, three hundred nine".