997513218 has 80 divisors (see below), whose sum is σ = 2416430016. Its totient is φ = 305739360.

The previous prime is 997513213. The next prime is 997513247. The reversal of 997513218 is 812315799.

It is not an unprimeable number, because it can be changed into a prime (997513213) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 654205 + ... + 655727.

Almost surely, 2^997513218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997513218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1208215008).

997513218 is an abundant number, since it is smaller than the sum of its proper divisors (1418916798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997513218 is a wasteful number, since it uses less digits than its factorization.

997513218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861 (or 1852 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 997513218 is about 31583.4326506794. The cubic root of 997513218 is about 999.1703845953.

The spelling of 997513218 in words is "nine hundred ninety-seven million, five hundred thirteen thousand, two hundred eighteen".