1239223229 has 2 divisors, whose sum is σ = 1239223230. Its totient is φ = 1239223228.

The previous prime is 1239223217. The next prime is 1239223231. The reversal of 1239223229 is 9223229321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1177176100 + 62047129 = 34310^2 + 7877^2 .

It is a cyclic number.

It is not a de Polignac number, because 1239223229 - 2⁴ = 1239223213 is a prime.

It is a super-2 number, since 2×1239223229² = 3071348422586372882, which contains 22 as substring.

Together with 1239223231, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1239223259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619611614 + 619611615.

It is an arithmetic number, because the mean of its divisors is an integer number (619611615).

Almost surely, 2^1239223229 is an apocalyptic number.

It is an amenable number.

1239223229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239223229 is an equidigital number, since it uses as much as digits as its factorization.

1239223229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 35.

The square root of 1239223229 is about 35202.6025884451. The cubic root of 1239223229 is about 1074.1126924417.

The spelling of 1239223229 in words is "one billion, two hundred thirty-nine million, two hundred twenty-three thousand, two hundred twenty-nine".