997159311 has 24 divisors (see below), whose sum is σ = 1517409920. Its totient is φ = 629261136.

The previous prime is 997159301. The next prime is 997159333. The reversal of 997159311 is 113951799.

It is a happy number.

It is not a de Polignac number, because 997159311 - 2⁵ = 997159279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997159301) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 375390 + ... + 378036.

Almost surely, 2^997159311 is an apocalyptic number.

997159311 is a deficient number, since it is larger than the sum of its proper divisors (520250609).

997159311 is a wasteful number, since it uses less digits than its factorization.

997159311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4875 (or 4872 counting only the distinct ones).

The product of its digits is 76545, while the sum is 45.

The square root of 997159311 is about 31577.8294219220. The cubic root of 997159311 is about 999.0522056363.

The spelling of 997159311 in words is "nine hundred ninety-seven million, one hundred fifty-nine thousand, three hundred eleven".