1268123761 has 2 divisors, whose sum is σ = 1268123762. Its totient is φ = 1268123760.

The previous prime is 1268123741. The next prime is 1268123771. The reversal of 1268123761 is 1673218621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1141426225 + 126697536 = 33785^2 + 11256^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268123761 - 2¹¹ = 1268121713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1268123761.

It is not a weakly prime, because it can be changed into another prime (1268123741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634061880 + 634061881.

It is an arithmetic number, because the mean of its divisors is an integer number (634061881).

Almost surely, 2^1268123761 is an apocalyptic number.

It is an amenable number.

1268123761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268123761 is an equidigital number, since it uses as much as digits as its factorization.

1268123761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 1268123761 is about 35610.7253646988. The cubic root of 1268123761 is about 1082.3985787885.

The spelling of 1268123761 in words is "one billion, two hundred sixty-eight million, one hundred twenty-three thousand, seven hundred sixty-one".