1166155909 has 2 divisors, whose sum is σ = 1166155910. Its totient is φ = 1166155908.

The previous prime is 1166155897. The next prime is 1166155931. The reversal of 1166155909 is 9095516611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 590635809 + 575520100 = 24303^2 + 23990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166155909 - 2⁵ = 1166155877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166152909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583077954 + 583077955.

It is an arithmetic number, because the mean of its divisors is an integer number (583077955).

Almost surely, 2^1166155909 is an apocalyptic number.

It is an amenable number.

1166155909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166155909 is an equidigital number, since it uses as much as digits as its factorization.

1166155909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72900, while the sum is 43.

The square root of 1166155909 is about 34149.0250080438. The cubic root of 1166155909 is about 1052.5729519905.

The spelling of 1166155909 in words is "one billion, one hundred sixty-six million, one hundred fifty-five thousand, nine hundred nine".