1268165189 has 2 divisors, whose sum is σ = 1268165190. Its totient is φ = 1268165188.

The previous prime is 1268165161. The next prime is 1268165209. The reversal of 1268165189 is 9815618621.

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., 1130102689 + 138062500 = 33617^2 + 11750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268165189 - 2²⁸ = 999729733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268164189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634082594 + 634082595.

It is an arithmetic number, because the mean of its divisors is an integer number (634082595).

Almost surely, 2^1268165189 is an apocalyptic number.

It is an amenable number.

1268165189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268165189 is an equidigital number, since it uses as much as digits as its factorization.

1268165189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 1268165189 is about 35611.3070386359. The cubic root of 1268165189 is about 1082.4103655245.

The spelling of 1268165189 in words is "one billion, two hundred sixty-eight million, one hundred sixty-five thousand, one hundred eighty-nine".