997755281 has 6 divisors (see below), whose sum is σ = 1001013510. Its totient is φ = 994507616.

The previous prime is 997755257. The next prime is 997755287. The reversal of 997755281 is 182557799.

It is a happy number.

997755281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 92948881 + 904806400 = 9641^2 + 30080^2 .

It is not a de Polignac number, because 997755281 - 2⁶ = 997755217 is a prime.

It is a super-2 number, since 2×997755281² = 1991031201526777922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997755287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95525 + ... + 105453.

It is an arithmetic number, because the mean of its divisors is an integer number (166835585).

Almost surely, 2^997755281 is an apocalyptic number.

It is an amenable number.

997755281 is a deficient number, since it is larger than the sum of its proper divisors (3258229).

997755281 is an frugal number, since it uses more digits than its factorization.

997755281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10563 (or 10246 counting only the distinct ones).

The product of its digits is 1587600, while the sum is 53.

The square root of 997755281 is about 31587.2645381014. The cubic root of 997755281 is about 999.2511997715.

The spelling of 997755281 in words is "nine hundred ninety-seven million, seven hundred fifty-five thousand, two hundred eighty-one".