1268173691 has 2 divisors, whose sum is σ = 1268173692. Its totient is φ = 1268173690.

The previous prime is 1268173679. The next prime is 1268173721. The reversal of 1268173691 is 1963718621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1268173691 - 2²⁶ = 1201064827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1268173391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634086845 + 634086846.

It is an arithmetic number, because the mean of its divisors is an integer number (634086846).

Almost surely, 2^1268173691 is an apocalyptic number.

1268173691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268173691 is an equidigital number, since it uses as much as digits as its factorization.

1268173691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 1268173691 is about 35611.4264106340. The cubic root of 1268173691 is about 1082.4127844082.

The spelling of 1268173691 in words is "one billion, two hundred sixty-eight million, one hundred seventy-three thousand, six hundred ninety-one".