1188142517 has 2 divisors, whose sum is σ = 1188142518. Its totient is φ = 1188142516.

The previous prime is 1188142489. The next prime is 1188142519. The reversal of 1188142517 is 7152418811.

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., 951167281 + 236975236 = 30841^2 + 15394^2 .

It is an emirp because it is prime and its reverse (7152418811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1188142517 - 2¹² = 1188138421 is a prime.

Together with 1188142519, 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 (1188142519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594071258 + 594071259.

It is an arithmetic number, because the mean of its divisors is an integer number (594071259).

Almost surely, 2^1188142517 is an apocalyptic number.

It is an amenable number.

1188142517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188142517 is an equidigital number, since it uses as much as digits as its factorization.

1188142517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17920, while the sum is 38.

The square root of 1188142517 is about 34469.4432360025. The cubic root of 1188142517 is about 1059.1468503062.

The spelling of 1188142517 in words is "one billion, one hundred eighty-eight million, one hundred forty-two thousand, five hundred seventeen".