Search a number
-
+
261223 is a prime number
BaseRepresentation
bin111111110001100111
3111021022221
4333301213
531324343
65333211
72135404
oct776147
9437287
10261223
11169296
12107207
1391b91
146b2ab
15525ed
hex3fc67

261223 has 2 divisors, whose sum is σ = 261224. Its totient is φ = 261222.

The previous prime is 261169. The next prime is 261229. The reversal of 261223 is 322162.

It is a strong prime.

261223 is a truncatable prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-261223 is a prime.

It is a nialpdrome in base 6.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 261197 and 261206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261229) 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, 130611 + 130612.

It is an arithmetic number, because the mean of its divisors is an integer number (130612).

2261223 is an apocalyptic number.

261223 is a deficient number, since it is larger than the sum of its proper divisors (1).

261223 is an equidigital number, since it uses as much as digits as its factorization.

261223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 16.

The square root of 261223 is about 511.0997945607. The cubic root of 261223 is about 63.9249608802.

Adding to 261223 its reverse (322162), we get a palindrome (583385).

It can be divided in two parts, 261 and 223, that added together give a palindrome (484).

The spelling of 261223 in words is "two hundred sixty-one thousand, two hundred twenty-three".