681427 has 2 divisors, whose sum is σ = 681428. Its totient is φ = 681426.

The previous prime is 681419. The next prime is 681449. The reversal of 681427 is 724186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681427 - 2³ = 681419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681395 and 681404.

It is not a weakly prime, because it can be changed into another prime (681407) 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, 340713 + 340714.

It is an arithmetic number, because the mean of its divisors is an integer number (340714).

2⁶⁸¹⁴²⁷ is an apocalyptic number.

681427 is a deficient number, since it is larger than the sum of its proper divisors (1).

681427 is an equidigital number, since it uses as much as digits as its factorization.

681427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 681427 is about 825.4859175056. The cubic root of 681427 is about 87.9980629739.

The spelling of 681427 in words is "six hundred eighty-one thousand, four hundred twenty-seven".