681425 has 12 divisors (see below), whose sum is σ = 856716. Its totient is φ = 537600.

The previous prime is 681419. The next prime is 681427. The reversal of 681425 is 524186.

681425 = 31² + 32² + ... + 127².

681425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 4096 + 677329 = 64^2 + 823^2 .

It is not a de Polignac number, because 681425 - 2⁴ = 681409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681394 and 681403.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681425.

It is not an unprimeable number, because it can be changed into a prime (681427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2285 + ... + 2565.

It is an arithmetic number, because the mean of its divisors is an integer number (71393).

2⁶⁸¹⁴²⁵ is an apocalyptic number.

It is an amenable number.

681425 is a deficient number, since it is larger than the sum of its proper divisors (175291).

681425 is a wasteful number, since it uses less digits than its factorization.

681425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 383 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 681425 is about 825.4847060970. The cubic root of 681425 is about 87.9979768819.

The spelling of 681425 in words is "six hundred eighty-one thousand, four hundred twenty-five".