997533909 has 24 divisors (see below), whose sum is σ = 1525249440. Its totient is φ = 627151392.

The previous prime is 997533907. The next prime is 997533941. The reversal of 997533909 is 909335799.

It is not a de Polignac number, because 997533909 - 2¹ = 997533907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997533907) 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, 33219 + ... + 55664.

It is an arithmetic number, because the mean of its divisors is an integer number (63552060).

Almost surely, 2^997533909 is an apocalyptic number.

It is an amenable number.

997533909 is a deficient number, since it is larger than the sum of its proper divisors (527715531).

997533909 is a wasteful number, since it uses less digits than its factorization.

997533909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88961 (or 88958 counting only the distinct ones).

The product of its (nonzero) digits is 2066715, while the sum is 54.

The square root of 997533909 is about 31583.7602099560. The cubic root of 997533909 is about 999.1772930055.

The spelling of 997533909 in words is "nine hundred ninety-seven million, five hundred thirty-three thousand, nine hundred nine".