685149 has 4 divisors (see below), whose sum is σ = 913536. Its totient is φ = 456764.

The previous prime is 685141. The next prime is 685169. The reversal of 685149 is 941586.

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 685149 - 2³ = 685141 is a prime.

It is a D-number.

685149 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685141) 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, 114189 + ... + 114194.

It is an arithmetic number, because the mean of its divisors is an integer number (228384).

2⁶⁸⁵¹⁴⁹ is an apocalyptic number.

It is an amenable number.

685149 is a deficient number, since it is larger than the sum of its proper divisors (228387).

685149 is a wasteful number, since it uses less digits than its factorization.

685149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228386.

The product of its digits is 8640, while the sum is 33.

The square root of 685149 is about 827.7372771598. The cubic root of 685149 is about 88.1579892586.

The spelling of 685149 in words is "six hundred eighty-five thousand, one hundred forty-nine".