11131229 has 2 divisors, whose sum is σ = 11131230. Its totient is φ = 11131228.

The previous prime is 11131187. The next prime is 11131231. The reversal of 11131229 is 92213111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7022500 + 4108729 = 2650^2 + 2027^2 .

It is an emirp because it is prime and its reverse (92213111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11131229 - 2¹⁶ = 11065693 is a prime.

Together with 11131231, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11131229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11131249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565614 + 5565615.

It is an arithmetic number, because the mean of its divisors is an integer number (5565615).

Almost surely, 2^11131229 is an apocalyptic number.

It is an amenable number.

11131229 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131229 is an equidigital number, since it uses as much as digits as its factorization.

11131229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 20.

The square root of 11131229 is about 3336.3496519400. The cubic root of 11131229 is about 223.2789112710.

The spelling of 11131229 in words is "eleven million, one hundred thirty-one thousand, two hundred twenty-nine".