1142111209 has 2 divisors, whose sum is σ = 1142111210. Its totient is φ = 1142111208.

The previous prime is 1142111167. The next prime is 1142111213. The reversal of 1142111209 is 9021112411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 799305984 + 342805225 = 28272^2 + 18515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1142111209 - 2⁷ = 1142111081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1142111209.

It is not a weakly prime, because it can be changed into another prime (1142111239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571055604 + 571055605.

It is an arithmetic number, because the mean of its divisors is an integer number (571055605).

Almost surely, 2^1142111209 is an apocalyptic number.

It is an amenable number.

1142111209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142111209 is an equidigital number, since it uses as much as digits as its factorization.

1142111209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1142111209 is about 33795.1358778153. The cubic root of 1142111209 is about 1045.2884009743.

The spelling of 1142111209 in words is "one billion, one hundred forty-two million, one hundred eleven thousand, two hundred nine".