Search a number
-
+
13220261 is a prime number
BaseRepresentation
bin110010011011…
…100110100101
3220212122210022
4302123212211
511341022021
61151204525
7220241015
oct62334645
926778708
1013220261
11750a63a
124516745
13297b552
141a81c45
1512621ab
hexc9b9a5

13220261 has 2 divisors, whose sum is σ = 13220262. Its totient is φ = 13220260.

The previous prime is 13220243. The next prime is 13220269. The reversal of 13220261 is 16202231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13184161 + 36100 = 3631^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 13220261 - 218 = 12958117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13220269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610130 + 6610131.

It is an arithmetic number, because the mean of its divisors is an integer number (6610131).

Almost surely, 213220261 is an apocalyptic number.

It is an amenable number.

13220261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13220261 is an equidigital number, since it uses as much as digits as its factorization.

13220261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 13220261 is about 3635.9676841248. The cubic root of 13220261 is about 236.4540061068.

Adding to 13220261 its reverse (16202231), we get a palindrome (29422492).

The spelling of 13220261 in words is "thirteen million, two hundred twenty thousand, two hundred sixty-one".