1166681387 has 2 divisors, whose sum is σ = 1166681388. Its totient is φ = 1166681386.

The previous prime is 1166681381. The next prime is 1166681419. The reversal of 1166681387 is 7831866611.

It is a weak prime.

It is an emirp because it is prime and its reverse (7831866611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1166681387 - 2⁶ = 1166681323 is a prime.

It is a super-2 number, since 2×1166681387² = 2722290917544487538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1166681381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583340693 + 583340694.

It is an arithmetic number, because the mean of its divisors is an integer number (583340694).

Almost surely, 2^1166681387 is an apocalyptic number.

1166681387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166681387 is an equidigital number, since it uses as much as digits as its factorization.

1166681387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 1166681387 is about 34156.7180361346. The cubic root of 1166681387 is about 1052.7310271583.

The spelling of 1166681387 in words is "one billion, one hundred sixty-six million, six hundred eighty-one thousand, three hundred eighty-seven".