1097281 has 4 divisors (see below), whose sum is σ = 1109700. Its totient is φ = 1084864.

The previous prime is 1097267. The next prime is 1097293. The reversal of 1097281 is 1827901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65025 + 1032256 = 255^2 + 1016^2 .

It is a cyclic number.

It is not a de Polignac number, because 1097281 - 2¹⁷ = 966209 is a prime.

It is a super-2 number, since 2×1097281² = 2408051185922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097221) 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, 6076 + ... + 6253.

It is an arithmetic number, because the mean of its divisors is an integer number (277425).

2^1097281 is an apocalyptic number.

It is an amenable number.

1097281 is a deficient number, since it is larger than the sum of its proper divisors (12419).

1097281 is an equidigital number, since it uses as much as digits as its factorization.

1097281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12418.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1097281 is about 1047.5118137759. The cubic root of 1097281 is about 103.1428877449.

It can be divided in two parts, 1097 and 281, that added together give a triangular number (1378 = T₅₂).

The spelling of 1097281 in words is "one million, ninety-seven thousand, two hundred eighty-one".