1211220239 has 2 divisors, whose sum is σ = 1211220240. Its totient is φ = 1211220238.

The previous prime is 1211220223. The next prime is 1211220247. The reversal of 1211220239 is 9320221121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9320221121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211220239 - 2⁴ = 1211220223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211220299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605610119 + 605610120.

It is an arithmetic number, because the mean of its divisors is an integer number (605610120).

Almost surely, 2^1211220239 is an apocalyptic number.

1211220239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211220239 is an equidigital number, since it uses as much as digits as its factorization.

1211220239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1211220239 is about 34802.5895444578. The cubic root of 1211220239 is about 1065.9603228699.

The spelling of 1211220239 in words is "one billion, two hundred eleven million, two hundred twenty thousand, two hundred thirty-nine".