2191229 has 2 divisors, whose sum is σ = 2191230. Its totient is φ = 2191228.

The previous prime is 2191199. The next prime is 2191243. The reversal of 2191229 is 9221912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1965604 + 225625 = 1402^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191229 - 2¹⁶ = 2125693 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2191198 and 2191207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2191429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095614 + 1095615.

It is an arithmetic number, because the mean of its divisors is an integer number (1095615).

2^2191229 is an apocalyptic number.

It is an amenable number.

2191229 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191229 is an equidigital number, since it uses as much as digits as its factorization.

2191229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 2191229 is about 1480.2800410733. The cubic root of 2191229 is about 129.8860737593.

The spelling of 2191229 in words is "two million, one hundred ninety-one thousand, two hundred twenty-nine".