669199 has 4 divisors (see below), whose sum is σ = 704440. Its totient is φ = 633960.

The previous prime is 669181. The next prime is 669241. The reversal of 669199 is 991966.

669199 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, and also an emirpimes, since its reverse is a distinct semiprime: 991966 = 2 ⋅495983.

It is a cyclic number.

It is not a de Polignac number, because 669199 - 2⁵ = 669167 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 (660199) 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, 17592 + ... + 17629.

It is an arithmetic number, because the mean of its divisors is an integer number (176110).

2⁶⁶⁹¹⁹⁹ is an apocalyptic number.

669199 is a deficient number, since it is larger than the sum of its proper divisors (35241).

669199 is a wasteful number, since it uses less digits than its factorization.

669199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35240.

The product of its digits is 26244, while the sum is 40.

The square root of 669199 is about 818.0458422362. The cubic root of 669199 is about 87.4685165644.

It can be divided in two parts, 669 and 199, that added together give a palindrome (868).

The spelling of 669199 in words is "six hundred sixty-nine thousand, one hundred ninety-nine".