681497 has 2 divisors, whose sum is σ = 681498. Its totient is φ = 681496.

The previous prime is 681493. The next prime is 681521. The reversal of 681497 is 794186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 491401 + 190096 = 701^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 681497 - 2² = 681493 is a prime.

It is a super-2 number, since 2×681497² = 928876322018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (681493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340748 + 340749.

It is an arithmetic number, because the mean of its divisors is an integer number (340749).

2⁶⁸¹⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

681497 is a deficient number, since it is larger than the sum of its proper divisors (1).

681497 is an equidigital number, since it uses as much as digits as its factorization.

681497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 681497 is about 825.5283156864. The cubic root of 681497 is about 88.0010760888.

The spelling of 681497 in words is "six hundred eighty-one thousand, four hundred ninety-seven".