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669221 = 795603
BaseRepresentation
bin10100011011000100101
31020222222222
42203120211
5132403341
622202125
75455040
oct2433045
91228888
10669221
11417883
12283345
131a57b7
14135c57
15d344b
hexa3625

669221 has 4 divisors (see below), whose sum is σ = 764832. Its totient is φ = 573612.

The previous prime is 669181. The next prime is 669241. The reversal of 669221 is 122966.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122966 = 261483.

It is a cyclic number.

It is not a de Polignac number, because 669221 - 214 = 652837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 9.

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, 47795 + ... + 47808.

It is an arithmetic number, because the mean of its divisors is an integer number (191208).

2669221 is an apocalyptic number.

It is an amenable number.

669221 is a deficient number, since it is larger than the sum of its proper divisors (95611).

669221 is an equidigital number, since it uses as much as digits as its factorization.

669221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95610.

The product of its digits is 1296, while the sum is 26.

The square root of 669221 is about 818.0592888049. The cubic root of 669221 is about 87.4694750667.

The spelling of 669221 in words is "six hundred sixty-nine thousand, two hundred twenty-one".

Divisors: 1 7 95603 669221