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BaseRepresentation
bin10011001101
31200112
4103031
514404
65405
73404
oct2315
91615
101229
11a18
12865
13737
1463b
1556e
hex4cd

1229 has 2 divisors, whose sum is σ = 1230. Its totient is φ = 1228.

The previous prime is 1223. The next prime is 1231. The reversal of 1229 is 9221.

1229 is nontrivially palindromic in base 13.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1225 + 4 = 35^2 + 2^2 .

It is an emirp because it is prime and its reverse (9221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1229 - 24 = 1213 is a prime.

It is a Sophie Germain prime.

Together with 1231, it forms a pair of twin primes.

It is a Chen prime.

1229 is an undulating number in base 13.

It is a Curzon number.

It is a plaindrome in base 10, base 15 and base 16.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614 + 615.

It is an arithmetic number, because the mean of its divisors is an integer number (615).

It is an amenable number.

1229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229 is an equidigital number, since it uses as much as digits as its factorization.

1229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 14.

The square root of 1229 is about 35.0570962859. The cubic root of 1229 is about 10.7115082748.

Multiplying 1229 by its product of digits (36), we get a palindrome (44244).

It can be divided in two parts, 122 and 9, that added together give a palindrome (131).

The spelling of 1229 in words is "one thousand, two hundred twenty-nine".