669331 has 4 divisors (see below), whose sum is σ = 720832. Its totient is φ = 617832.

The previous prime is 669329. The next prime is 669359. The reversal of 669331 is 133966.

669331 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 is a cyclic number.

It is not a de Polignac number, because 669331 - 2¹ = 669329 is a prime.

It is a super-2 number, since 2×669331² = 896007975122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669331.

It is not an unprimeable number, because it can be changed into a prime (669301) 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, 25731 + ... + 25756.

It is an arithmetic number, because the mean of its divisors is an integer number (180208).

2⁶⁶⁹³³¹ is an apocalyptic number.

669331 is a deficient number, since it is larger than the sum of its proper divisors (51501).

669331 is a wasteful number, since it uses less digits than its factorization.

669331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51500.

The product of its digits is 2916, while the sum is 28.

The square root of 669331 is about 818.1265183332. The cubic root of 669331 is about 87.4742672630.

It can be divided in two parts, 6693 and 31, that added together give a square (6724 = 82²).

The spelling of 669331 in words is "six hundred sixty-nine thousand, three hundred thirty-one".