1268563951 has 2 divisors, whose sum is σ = 1268563952. Its totient is φ = 1268563950.

The previous prime is 1268563889. The next prime is 1268563969. The reversal of 1268563951 is 1593658621.

It is a strong prime.

It is an emirp because it is prime and its reverse (1593658621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268563951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268563151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634281975 + 634281976.

It is an arithmetic number, because the mean of its divisors is an integer number (634281976).

Almost surely, 2^1268563951 is an apocalyptic number.

1268563951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268563951 is an equidigital number, since it uses as much as digits as its factorization.

1268563951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 46.

The square root of 1268563951 is about 35616.9054102122. The cubic root of 1268563951 is about 1082.5238047131.

It can be divided in two parts, 12685 and 63951, that added together give a triangular number (76636 = T₃₉₁).

The spelling of 1268563951 in words is "one billion, two hundred sixty-eight million, five hundred sixty-three thousand, nine hundred fifty-one".