669901 has 2 divisors, whose sum is σ = 669902. Its totient is φ = 669900.

The previous prime is 669887. The next prime is 669913. The reversal of 669901 is 109966.

669901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561001 + 108900 = 749^2 + 330^2 .It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 106699 and 996601.

It is a cyclic number.

It is not a de Polignac number, because 669901 - 2⁵ = 669869 is a prime.

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 669901.

It is not a weakly prime, because it can be changed into another prime (669931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334950 + 334951.

It is an arithmetic number, because the mean of its divisors is an integer number (334951).

2⁶⁶⁹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

669901 is a deficient number, since it is larger than the sum of its proper divisors (1).

669901 is an equidigital number, since it uses as much as digits as its factorization.

669901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 669901 is about 818.4748010782. The cubic root of 669901 is about 87.4990911470.

The spelling of 669901 in words is "six hundred sixty-nine thousand, nine hundred one".