997191072 has 36 divisors (see below), whose sum is σ = 2835762930. Its totient is φ = 332396928.

The previous prime is 997191047. The next prime is 997191073. The reversal of 997191072 is 270191799.

It can be written as a sum of positive squares in only one way, i.e., 676208016 + 320983056 = 26004^2 + 17916^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (997191073) 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 5 ways as a sum of consecutive naturals, for example, 1730947 + ... + 1731522.

Almost surely, 2^997191072 is an apocalyptic number.

It is an amenable number.

997191072 is an abundant number, since it is smaller than the sum of its proper divisors (1838571858).

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

997191072 is a wasteful number, since it uses less digits than its factorization.

997191072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3462485 (or 3462474 counting only the distinct ones).

The product of its (nonzero) digits is 71442, while the sum is 45.

The square root of 997191072 is about 31578.3323182210. The cubic root of 997191072 is about 999.0628126209.

The spelling of 997191072 in words is "nine hundred ninety-seven million, one hundred ninety-one thousand, seventy-two".