1188211049 has 2 divisors, whose sum is σ = 1188211050. Its totient is φ = 1188211048.

The previous prime is 1188211043. The next prime is 1188211091. The reversal of 1188211049 is 9401128811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 811851049 + 376360000 = 28493^2 + 19400^2 .

It is an emirp because it is prime and its reverse (9401128811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1188211049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1188211043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594105524 + 594105525.

It is an arithmetic number, because the mean of its divisors is an integer number (594105525).

Almost surely, 2^1188211049 is an apocalyptic number.

It is an amenable number.

1188211049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188211049 is an equidigital number, since it uses as much as digits as its factorization.

1188211049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 1188211049 is about 34470.4373195351. The cubic root of 1188211049 is about 1059.1672137602.

The spelling of 1188211049 in words is "one billion, one hundred eighty-eight million, two hundred eleven thousand, forty-nine".