681019 has 2 divisors, whose sum is σ = 681020. Its totient is φ = 681018.

The previous prime is 681011. The next prime is 681041. The reversal of 681019 is 910186.

681019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681019 - 2³ = 681011 is a prime.

It is a super-2 number, since 2×681019² = 927573756722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 680984 and 681002.

It is not a weakly prime, because it can be changed into another prime (681011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340509 + 340510.

It is an arithmetic number, because the mean of its divisors is an integer number (340510).

2⁶⁸¹⁰¹⁹ is an apocalyptic number.

681019 is a deficient number, since it is larger than the sum of its proper divisors (1).

681019 is an equidigital number, since it uses as much as digits as its factorization.

681019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 681019 is about 825.2387533314. The cubic root of 681019 is about 87.9804967109.

The spelling of 681019 in words is "six hundred eighty-one thousand, nineteen".