669951 has 14 divisors (see below), whose sum is σ = 1005560. Its totient is φ = 446148.

The previous prime is 669947. The next prime is 669971. The reversal of 669951 is 159966.

669951 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 669951 - 2² = 669947 is a prime.

It is a Duffinian number.

669951 is strictly pandigital in base 7.

669951 is a lucky 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 669951.

It is not an unprimeable number, because it can be changed into a prime (669901) 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 13 ways as a sum of consecutive naturals, for example, 270 + ... + 1188.

2⁶⁶⁹⁹⁵¹ is an apocalyptic number.

669951 is a deficient number, since it is larger than the sum of its proper divisors (335609).

669951 is an frugal number, since it uses more digits than its factorization.

669951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937 (or 922 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 669951 is about 818.5053451261. The cubic root of 669951 is about 87.5012680088.

The spelling of 669951 in words is "six hundred sixty-nine thousand, nine hundred fifty-one".