797681 has 2 divisors, whose sum is σ = 797682. Its totient is φ = 797680.

The previous prime is 797647. The next prime is 797689. The reversal of 797681 is 186797.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 739600 + 58081 = 860^2 + 241^2 .

It is a cyclic number.

It is not a de Polignac number, because 797681 - 2¹⁰ = 796657 is a prime.

It is a super-2 number, since 2×797681² = 1272589955522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (797689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398840 + 398841.

It is an arithmetic number, because the mean of its divisors is an integer number (398841).

2⁷⁹⁷⁶⁸¹ is an apocalyptic number.

It is an amenable number.

797681 is a deficient number, since it is larger than the sum of its proper divisors (1).

797681 is an equidigital number, since it uses as much as digits as its factorization.

797681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 38.

The square root of 797681 is about 893.1298897697. The cubic root of 797681 is about 92.7419911568.

The spelling of 797681 in words is "seven hundred ninety-seven thousand, six hundred eighty-one".