669913 has 2 divisors, whose sum is σ = 669914. Its totient is φ = 669912.

The previous prime is 669901. The next prime is 669923. The reversal of 669913 is 319966.

669913 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., 589824 + 80089 = 768^2 + 283^2 .

It is a cyclic number.

It is not a de Polignac number, because 669913 - 2⁹ = 669401 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (669923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334956 + 334957.

It is an arithmetic number, because the mean of its divisors is an integer number (334957).

2⁶⁶⁹⁹¹³ is an apocalyptic number.

It is an amenable number.

669913 is a deficient number, since it is larger than the sum of its proper divisors (1).

669913 is an equidigital number, since it uses as much as digits as its factorization.

669913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 34.

The square root of 669913 is about 818.4821317537. The cubic root of 669913 is about 87.4996136037.

The spelling of 669913 in words is "six hundred sixty-nine thousand, nine hundred thirteen".