667129 has 2 divisors, whose sum is σ = 667130. Its totient is φ = 667128.

The previous prime is 667127. The next prime is 667141. The reversal of 667129 is 921766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522729 + 144400 = 723^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 667129 - 2¹ = 667127 is a prime.

It is a super-2 number, since 2×667129² = 890122205282, which contains 22 as substring.

Together with 667127, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 667129.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333564 + 333565.

It is an arithmetic number, because the mean of its divisors is an integer number (333565).

2⁶⁶⁷¹²⁹ is an apocalyptic number.

It is an amenable number.

667129 is a deficient number, since it is larger than the sum of its proper divisors (1).

667129 is an equidigital number, since it uses as much as digits as its factorization.

667129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 667129 is about 816.7796520482. The cubic root of 667129 is about 87.3782360756.

The spelling of 667129 in words is "six hundred sixty-seven thousand, one hundred twenty-nine".