669081 has 16 divisors (see below), whose sum is σ = 1031168. Its totient is φ = 378000.

The previous prime is 669077. The next prime is 669089. The reversal of 669081 is 180966.

669081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 669081 - 2² = 669077 is a prime.

It is a super-2 number, since 2×669081² = 895338769122, which contains 22 as substring.

It is a Duffinian number.

669081 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3066 + ... + 3276.

It is an arithmetic number, because the mean of its divisors is an integer number (64448).

2⁶⁶⁹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

669081 is a deficient number, since it is larger than the sum of its proper divisors (362087).

669081 is a wasteful number, since it uses less digits than its factorization.

669081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 669081 is about 817.9737159591. The cubic root of 669081 is about 87.4633751483.

The spelling of 669081 in words is "six hundred sixty-nine thousand, eighty-one".