669071 has 12 divisors (see below), whose sum is σ = 751032. Its totient is φ = 595296.

The previous prime is 669049. The next prime is 669077. The reversal of 669071 is 170966.

It is a happy number.

It is not a de Polignac number, because 669071 - 2¹⁰ = 668047 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 (669077) 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 11 ways as a sum of consecutive naturals, for example, 6200 + ... + 6306.

It is an arithmetic number, because the mean of its divisors is an integer number (62586).

2⁶⁶⁹⁰⁷¹ is an apocalyptic number.

669071 is a deficient number, since it is larger than the sum of its proper divisors (81961).

669071 is a wasteful number, since it uses less digits than its factorization.

669071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 157 counting only the distinct ones).

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

The square root of 669071 is about 817.9676032704. The cubic root of 669071 is about 87.4629394073.

The spelling of 669071 in words is "six hundred sixty-nine thousand, seventy-one".