Search a number
BaseRepresentation
bin110010011011…
…100110000111
3220212122202012
4302123212013
511341021411
61151204435
7220240643
oct62334607
926778665
1013220231
11750a612
12451671b
13297b52b
141a81c23
15126218b
hexc9b987

13220231 has 2 divisors, whose sum is σ = 13220232. Its totient is φ = 13220230.

The previous prime is 13220213. The next prime is 13220243. The reversal of 13220231 is 13202231.

Adding to 13220231 its reverse (13202231), we get a palindrome (26422462).

It is a happy number.

Together with previous prime (13220213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13220231 - 214 = 13203847 is a prime.

It is a super-2 number, since 2×132202312 = 349549015386722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13220261) 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, 6610115 + 6610116.

It is an arithmetic number, because the mean of its divisors is an integer number (6610116).

Almost surely, 213220231 is an apocalyptic number.

13220231 is a deficient number, since it is larger than the sum of its proper divisors (1).

13220231 is an equidigital number, since it uses as much as digits as its factorization.

13220231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 13220231 is about 3635.9635586733. The cubic root of 13220231 is about 236.4538272493.

The spelling of 13220231 in words is "thirteen million, two hundred twenty thousand, two hundred thirty-one".