667109 has 4 divisors (see below), whose sum is σ = 702240. Its totient is φ = 631980.

The previous prime is 667103. The next prime is 667123. The reversal of 667109 is 901766.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 901766 = 2 ⋅450883.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667103) 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, 17537 + ... + 17574.

It is an arithmetic number, because the mean of its divisors is an integer number (175560).

2⁶⁶⁷¹⁰⁹ is an apocalyptic number.

It is an amenable number.

667109 is a deficient number, since it is larger than the sum of its proper divisors (35131).

667109 is a wasteful number, since it uses less digits than its factorization.

667109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35130.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 667109 is about 816.7674087523. The cubic root of 667109 is about 87.3773628901.

The spelling of 667109 in words is "six hundred sixty-seven thousand, one hundred nine".