997518522 has 128 divisors (see below), whose sum is σ = 2692343808. Its totient is φ = 237945600.

The previous prime is 997518493. The next prime is 997518523. The reversal of 997518522 is 225815799.

It is not an unprimeable number, because it can be changed into a prime (997518523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1843572 + ... + 1844112.

It is an arithmetic number, because the mean of its divisors is an integer number (21033936).

Almost surely, 2^997518522 is an apocalyptic number.

997518522 is the 25788-th pentagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997518522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346171904).

997518522 is an abundant number, since it is smaller than the sum of its proper divisors (1694825286).

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

997518522 is a wasteful number, since it uses less digits than its factorization.

997518522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884.

The product of its digits is 453600, while the sum is 48.

The square root of 997518522 is about 31583.5166186414. The cubic root of 997518522 is about 999.1721555293.

The spelling of 997518522 in words is "nine hundred ninety-seven million, five hundred eighteen thousand, five hundred twenty-two".