997548993 has 16 divisors (see below), whose sum is σ = 1688972160. Its totient is φ = 570027888.

The previous prime is 997548977. The next prime is 997549019. The reversal of 997548993 is 399845799.

It is a happy number.

It is not a de Polignac number, because 997548993 - 2⁴ = 997548977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 997548993.

It is not an unprimeable number, because it can be changed into a prime (997548913) 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 15 ways as a sum of consecutive naturals, for example, 2638830 + ... + 2639207.

It is an arithmetic number, because the mean of its divisors is an integer number (105560760).

Almost surely, 2^997548993 is an apocalyptic number.

It is an amenable number.

997548993 is a deficient number, since it is larger than the sum of its proper divisors (691423167).

997548993 is a wasteful number, since it uses less digits than its factorization.

997548993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278053 (or 5278047 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 63.

The square root of 997548993 is about 31583.9990026596. Note that the first 3 decimals coincide. The cubic root of 997548993 is about 999.1823292635.

Adding to 997548993 its sum of digits (63), we get a square (997549056 = 31584²).

The spelling of 997548993 in words is "nine hundred ninety-seven million, five hundred forty-eight thousand, nine hundred ninety-three".