681507 has 16 divisors (see below), whose sum is σ = 1034880. Its totient is φ = 443016.

The previous prime is 681497. The next prime is 681521. The reversal of 681507 is 705186.

It is not a de Polignac number, because 681507 - 2⁸ = 681251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681507.

It is not an unprimeable number, because it can be changed into a prime (681557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 868 + ... + 1454.

It is an arithmetic number, because the mean of its divisors is an integer number (64680).

2⁶⁸¹⁵⁰⁷ is an apocalyptic number.

681507 is a deficient number, since it is larger than the sum of its proper divisors (353373).

681507 is a wasteful number, since it uses less digits than its factorization.

681507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 633 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 681507 is about 825.5343723916. The cubic root of 681507 is about 88.0015065169.

The spelling of 681507 in words is "six hundred eighty-one thousand, five hundred seven".