1268607889 has 2 divisors, whose sum is σ = 1268607890. Its totient is φ = 1268607888.

The previous prime is 1268607817. The next prime is 1268607913. The reversal of 1268607889 is 9887068621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1004382864 + 264225025 = 31692^2 + 16255^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268607889 - 2¹³ = 1268599697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1268607089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634303944 + 634303945.

It is an arithmetic number, because the mean of its divisors is an integer number (634303945).

Almost surely, 2^1268607889 is an apocalyptic number.

It is an amenable number.

1268607889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268607889 is an equidigital number, since it uses as much as digits as its factorization.

1268607889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The square root of 1268607889 is about 35617.5222187058. The cubic root of 1268607889 is about 1082.5363026724.

The spelling of 1268607889 in words is "one billion, two hundred sixty-eight million, six hundred seven thousand, eight hundred eighty-nine".