1268516987 has 2 divisors, whose sum is σ = 1268516988. Its totient is φ = 1268516986.

The previous prime is 1268516959. The next prime is 1268516989. The reversal of 1268516987 is 7896158621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1268516987 - 2⁶ = 1268516923 is a prime.

Together with 1268516989, 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 (1268516989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634258493 + 634258494.

It is an arithmetic number, because the mean of its divisors is an integer number (634258494).

Almost surely, 2^1268516987 is an apocalyptic number.

1268516987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268516987 is an equidigital number, since it uses as much as digits as its factorization.

1268516987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 53.

The square root of 1268516987 is about 35616.2461104480. The cubic root of 1268516987 is about 1082.5104457031.

The spelling of 1268516987 in words is "one billion, two hundred sixty-eight million, five hundred sixteen thousand, nine hundred eighty-seven".