1097681 has 4 divisors (see below), whose sum is σ = 1182132. Its totient is φ = 1013232.

The previous prime is 1097669. The next prime is 1097699. The reversal of 1097681 is 1867901.

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 483025 + 614656 = 695^2 + 784^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1097681 is a prime.

It is a super-2 number, since 2×1097681² = 2409807155522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097651) 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, 42206 + ... + 42231.

It is an arithmetic number, because the mean of its divisors is an integer number (295533).

2^1097681 is an apocalyptic number.

It is an amenable number.

1097681 is a deficient number, since it is larger than the sum of its proper divisors (84451).

1097681 is an equidigital number, since it uses as much as digits as its factorization.

1097681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84450.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1097681 is about 1047.7027250132. The cubic root of 1097681 is about 103.1554193702.

The spelling of 1097681 in words is "one million, ninety-seven thousand, six hundred eighty-one".