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143221 = 1323479
BaseRepresentation
bin100010111101110101
321021110111
4202331311
514040341
63023021
71134361
oct427565
9237414
10143221
1198671
126aa71
1350260
143a2a1
152c681
hex22f75

143221 has 8 divisors (see below), whose sum is σ = 161280. Its totient is φ = 126192.

The previous prime is 143197. The next prime is 143239. The reversal of 143221 is 122341.

Adding to 143221 its reverse (122341), we get a palindrome (265562).

It is the 155-th star number.

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

It is a cyclic number.

It is not a de Polignac number, because 143221 - 27 = 143093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an Ulam 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 (143261) 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, 60 + ... + 538.

It is an arithmetic number, because the mean of its divisors is an integer number (20160).

2143221 is an apocalyptic number.

It is an amenable number.

143221 is a deficient number, since it is larger than the sum of its proper divisors (18059).

143221 is a wasteful number, since it uses less digits than its factorization.

143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its digits is 48, while the sum is 13.

The square root of 143221 is about 378.4455046635. The cubic root of 143221 is about 52.3201403809.

The spelling of 143221 in words is "one hundred forty-three thousand, two hundred twenty-one", and thus it is an iban number.

Divisors: 1 13 23 299 479 6227 11017 143221