681455 has 8 divisors (see below), whose sum is σ = 829392. Its totient is φ = 537408.

The previous prime is 681451. The next prime is 681481. The reversal of 681455 is 554186.

It is a happy number.

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 681455 - 2² = 681451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681455.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 569 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (103674).

2⁶⁸¹⁴⁵⁵ is an apocalyptic number.

681455 is a deficient number, since it is larger than the sum of its proper divisors (147937).

681455 is a wasteful number, since it uses less digits than its factorization.

681455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945.

The product of its digits is 4800, while the sum is 29.

The square root of 681455 is about 825.5028770392. The cubic root of 681455 is about 87.9992682446. Note that the first 3 decimals are identical.

It can be divided in two parts, 68145 and 5, that multiplied together give a triangular number (340725 = T₈₂₅).

The spelling of 681455 in words is "six hundred eighty-one thousand, four hundred fifty-five".