669013 has 4 divisors (see below), whose sum is σ = 676620. Its totient is φ = 661408.

The previous prime is 668999. The next prime is 669023. The reversal of 669013 is 310966.

669013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 400689 + 268324 = 633^2 + 518^2 .

It is a cyclic number.

It is not a de Polignac number, because 669013 - 2¹⁷ = 537941 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 (669023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3670 + ... + 3847.

It is an arithmetic number, because the mean of its divisors is an integer number (169155).

2⁶⁶⁹⁰¹³ is an apocalyptic number.

It is an amenable number.

669013 is a deficient number, since it is larger than the sum of its proper divisors (7607).

669013 is an equidigital number, since it uses as much as digits as its factorization.

669013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7606.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 669013 is about 817.9321487752. The cubic root of 669013 is about 87.4604120237.

Adding to 669013 its reverse (310966), we get a palindrome (979979).

The spelling of 669013 in words is "six hundred sixty-nine thousand, thirteen".