997281 has 12 divisors (see below), whose sum is σ = 1490580. Its totient is φ = 641760.

The previous prime is 997279. The next prime is 997307. The reversal of 997281 is 182799.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 731025 + 266256 = 855^2 + 516^2 .

It is not a de Polignac number, because 997281 - 2¹ = 997279 is a prime.

It is a super-2 number, since 2×997281² = 1989138785922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (997201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1650 + ... + 2171.

It is an arithmetic number, because the mean of its divisors is an integer number (124215).

2⁹⁹⁷²⁸¹ is an apocalyptic number.

It is an amenable number.

997281 is a deficient number, since it is larger than the sum of its proper divisors (493299).

997281 is a wasteful number, since it uses less digits than its factorization.

997281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3856 (or 3853 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 997281 is about 998.6395746214. The cubic root of 997281 is about 99.9092843983.

The spelling of 997281 in words is "nine hundred ninety-seven thousand, two hundred eighty-one".