669281 has 4 divisors (see below), whose sum is σ = 673200. Its totient is φ = 665364.

The previous prime is 669271. The next prime is 669283. The reversal of 669281 is 182966.

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.

It is a cyclic number.

It is not a de Polignac number, because 669281 - 2¹⁸ = 407137 is a prime.

It is a super-2 number, since 2×669281² = 895874113922, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669281.

It is not an unprimeable number, because it can be changed into a prime (669283) 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, 1691 + ... + 2048.

It is an arithmetic number, because the mean of its divisors is an integer number (168300).

2⁶⁶⁹²⁸¹ is an apocalyptic number.

It is an amenable number.

669281 is a deficient number, since it is larger than the sum of its proper divisors (3919).

669281 is a wasteful number, since it uses less digits than its factorization.

669281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3918.

The product of its digits is 5184, while the sum is 32.

The square root of 669281 is about 818.0959601416. The cubic root of 669281 is about 87.4720890570.

The spelling of 669281 in words is "six hundred sixty-nine thousand, two hundred eighty-one".