997221752 has 16 divisors (see below), whose sum is σ = 1870717200. Its totient is φ = 498363840.

The previous prime is 997221749. The next prime is 997221761. The reversal of 997221752 is 257122799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13124 + ... + 46547.

It is an arithmetic number, because the mean of its divisors is an integer number (116919825).

Almost surely, 2^997221752 is an apocalyptic number.

It is an amenable number.

997221752 is a deficient number, since it is larger than the sum of its proper divisors (873495448).

997221752 is a wasteful number, since it uses less digits than its factorization.

997221752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61766 (or 61762 counting only the distinct ones).

The product of its digits is 158760, while the sum is 44.

The square root of 997221752 is about 31578.8180906126. The cubic root of 997221752 is about 999.0730583780.

The spelling of 997221752 in words is "nine hundred ninety-seven million, two hundred twenty-one thousand, seven hundred fifty-two".