669169 has 4 divisors (see below), whose sum is σ = 673344. Its totient is φ = 664996.

The previous prime is 669167. The next prime is 669173. The reversal of 669169 is 961966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669169 - 2¹ = 669167 is a prime.

It is a super-2 number, since 2×669169² = 895574301122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (669167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1837 + ... + 2170.

It is an arithmetic number, because the mean of its divisors is an integer number (168336).

2⁶⁶⁹¹⁶⁹ is an apocalyptic number.

It is an amenable number.

669169 is a deficient number, since it is larger than the sum of its proper divisors (4175).

669169 is a wasteful number, since it uses less digits than its factorization.

669169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4174.

The product of its digits is 17496, while the sum is 37.

The square root of 669169 is about 818.0275056500. The cubic root of 669169 is about 87.4672094820.

It can be divided in two parts, 669 and 169, that added together give a palindrome (838).

The spelling of 669169 in words is "six hundred sixty-nine thousand, one hundred sixty-nine".