669261 has 4 divisors (see below), whose sum is σ = 892352. Its totient is φ = 446172.

The previous prime is 669247. The next prime is 669271. The reversal of 669261 is 162966.

669261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 669261 - 2⁷ = 669133 is a prime.

It is a super-2 number, since 2×669261² = 895820572242, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669241) 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, 111541 + ... + 111546.

It is an arithmetic number, because the mean of its divisors is an integer number (223088).

2⁶⁶⁹²⁶¹ is an apocalyptic number.

It is an amenable number.

669261 is a deficient number, since it is larger than the sum of its proper divisors (223091).

669261 is a wasteful number, since it uses less digits than its factorization.

669261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223090.

The product of its digits is 3888, while the sum is 30.

The square root of 669261 is about 818.0837365453. The cubic root of 669261 is about 87.4712177443.

The spelling of 669261 in words is "six hundred sixty-nine thousand, two hundred sixty-one".