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4221661 = 171032411
BaseRepresentation
bin10000000110101011011101
321221111000211
4100012223131
52040043121
6230252421
750612023
oct20065335
97844024
104221661
112423884
1214b7111
13b4a732
147bc713
15585ce1
hex406add

4221661 has 8 divisors (see below), whose sum is σ = 4515264. Its totient is φ = 3933120.

The previous prime is 4221653. The next prime is 4221671. The reversal of 4221661 is 1661224.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4221661 - 23 = 4221653 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 (4221631) 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 7 ways as a sum of consecutive naturals, for example, 546 + ... + 2956.

It is an arithmetic number, because the mean of its divisors is an integer number (564408).

Almost surely, 24221661 is an apocalyptic number.

It is an amenable number.

4221661 is a deficient number, since it is larger than the sum of its proper divisors (293603).

4221661 is a wasteful number, since it uses less digits than its factorization.

4221661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531.

The product of its digits is 576, while the sum is 22.

The square root of 4221661 is about 2054.6680997183. The cubic root of 4221661 is about 161.6197580039.

Adding to 4221661 its reverse (1661224), we get a palindrome (5882885).

The spelling of 4221661 in words is "four million, two hundred twenty-one thousand, six hundred sixty-one".

Divisors: 1 17 103 1751 2411 40987 248333 4221661