997331 has 4 divisors (see below), whose sum is σ = 1005312. Its totient is φ = 989352.

The previous prime is 997327. The next prime is 997333. The reversal of 997331 is 133799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133799 = 67 ⋅1997.

It is a cyclic number.

It is not a de Polignac number, because 997331 - 2² = 997327 is a prime.

It is a super-2 number, since 2×997331² = 1989338247122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (997333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3800 + ... + 4053.

It is an arithmetic number, because the mean of its divisors is an integer number (251328).

2⁹⁹⁷³³¹ is an apocalyptic number.

997331 is a deficient number, since it is larger than the sum of its proper divisors (7981).

997331 is a wasteful number, since it uses less digits than its factorization.

997331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7980.

The product of its digits is 5103, while the sum is 32.

The square root of 997331 is about 998.6646083646. The cubic root of 997331 is about 99.9109540651.

The spelling of 997331 in words is "nine hundred ninety-seven thousand, three hundred thirty-one".