685481 has 4 divisors (see below), whose sum is σ = 688464. Its totient is φ = 682500.

The previous prime is 685471. The next prime is 685493. The reversal of 685481 is 184586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 685481 - 2⁶ = 685417 is a prime.

It is a super-2 number, since 2×685481² = 939768402722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685471) 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 3 ways as a sum of consecutive naturals, for example, 1115 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (172116).

2⁶⁸⁵⁴⁸¹ is an apocalyptic number.

It is an amenable number.

685481 is a deficient number, since it is larger than the sum of its proper divisors (2983).

685481 is a wasteful number, since it uses less digits than its factorization.

685481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2982.

The product of its digits is 7680, while the sum is 32.

The square root of 685481 is about 827.9377995961. The cubic root of 685481 is about 88.1722264179.

The spelling of 685481 in words is "six hundred eighty-five thousand, four hundred eighty-one".