1166559391 has 2 divisors, whose sum is σ = 1166559392. Its totient is φ = 1166559390.

The previous prime is 1166559349. The next prime is 1166559403. The reversal of 1166559391 is 1939556611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1166559391 - 2⁹ = 1166558879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166559991) 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, 583279695 + 583279696.

It is an arithmetic number, because the mean of its divisors is an integer number (583279696).

Almost surely, 2^1166559391 is an apocalyptic number.

1166559391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166559391 is an equidigital number, since it uses as much as digits as its factorization.

1166559391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 218700, while the sum is 46.

The square root of 1166559391 is about 34154.9321621344. The cubic root of 1166559391 is about 1052.6943323496.

The spelling of 1166559391 in words is "one billion, one hundred sixty-six million, five hundred fifty-nine thousand, three hundred ninety-one".