1268607913 has 2 divisors, whose sum is σ = 1268607914. Its totient is φ = 1268607912.

The previous prime is 1268607889. The next prime is 1268607917. The reversal of 1268607913 is 3197068621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1252310544 + 16297369 = 35388^2 + 4037^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268607913 - 2⁹ = 1268607401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1268607913.

It is not a weakly prime, because it can be changed into another prime (1268607917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634303956 + 634303957.

It is an arithmetic number, because the mean of its divisors is an integer number (634303957).

Almost surely, 2^1268607913 is an apocalyptic number.

It is an amenable number.

1268607913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268607913 is an equidigital number, since it uses as much as digits as its factorization.

1268607913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 1268607913 is about 35617.5225556186. The cubic root of 1268607913 is about 1082.5363094990.

The spelling of 1268607913 in words is "one billion, two hundred sixty-eight million, six hundred seven thousand, nine hundred thirteen".