669125 has 16 divisors (see below), whose sum is σ = 859248. Its totient is φ = 520000.

The previous prime is 669121. The next prime is 669127. The reversal of 669125 is 521966.

669125 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 818²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 25921 + 643204 = 161^2 + 802^2 .

It is not a de Polignac number, because 669125 - 2² = 669121 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669121) 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, 6575 + ... + 6675.

It is an arithmetic number, because the mean of its divisors is an integer number (53703).

2⁶⁶⁹¹²⁵ is an apocalyptic number.

It is an amenable number.

669125 is a deficient number, since it is larger than the sum of its proper divisors (190123).

669125 is a wasteful number, since it uses less digits than its factorization.

669125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 159 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 669125 is about 818.0006112467. Note that the first 3 decimals coincide. The cubic root of 669125 is about 87.4652923572.

The spelling of 669125 in words is "six hundred sixty-nine thousand, one hundred twenty-five".