681457 has 8 divisors (see below), whose sum is σ = 790976. Its totient is φ = 574992.

The previous prime is 681451. The next prime is 681481. The reversal of 681457 is 754186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681457 - 2³ = 681449 is a prime.

It is a Duffinian number.

681457 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (681451) 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 in 7 ways as a sum of consecutive naturals, for example, 258 + ... + 1195.

It is an arithmetic number, because the mean of its divisors is an integer number (98872).

2⁶⁸¹⁴⁵⁷ is an apocalyptic number.

681457 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

681457 is a deficient number, since it is larger than the sum of its proper divisors (109519).

681457 is a wasteful number, since it uses less digits than its factorization.

681457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527.

The product of its digits is 6720, while the sum is 31.

The square root of 681457 is about 825.5040884211. The cubic root of 681457 is about 87.9993543341. Note that the first 3 decimals are identical.

The spelling of 681457 in words is "six hundred eighty-one thousand, four hundred fifty-seven".