1172166209 has 2 divisors, whose sum is σ = 1172166210. Its totient is φ = 1172166208.

The previous prime is 1172166199. The next prime is 1172166211. The reversal of 1172166209 is 9026612711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1152806209 + 19360000 = 33953^2 + 4400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1172166209 is a prime.

Together with 1172166211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1172166299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 586083104 + 586083105.

It is an arithmetic number, because the mean of its divisors is an integer number (586083105).

Almost surely, 2^1172166209 is an apocalyptic number.

It is an amenable number.

1172166209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1172166209 is an equidigital number, since it uses as much as digits as its factorization.

1172166209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1172166209 is about 34236.9129595529. The cubic root of 1172166209 is about 1054.3781542373.

The spelling of 1172166209 in words is "one billion, one hundred seventy-two million, one hundred sixty-six thousand, two hundred nine".