1268121823 has 2 divisors, whose sum is σ = 1268121824. Its totient is φ = 1268121822.

The previous prime is 1268121791. The next prime is 1268121857. The reversal of 1268121823 is 3281218621.

It is a happy number.

It is an a-pointer prime, because the next prime (1268121857) can be obtained adding 1268121823 to its sum of digits (34).

It is a weak prime.

It is an emirp because it is prime and its reverse (3281218621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1268121823 - 2⁵ = 1268121791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268121223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634060911 + 634060912.

It is an arithmetic number, because the mean of its divisors is an integer number (634060912).

Almost surely, 2^1268121823 is an apocalyptic number.

1268121823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268121823 is an equidigital number, since it uses as much as digits as its factorization.

1268121823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 34.

The square root of 1268121823 is about 35610.6981537852. The cubic root of 1268121823 is about 1082.3980273992.

The spelling of 1268121823 in words is "one billion, two hundred sixty-eight million, one hundred twenty-one thousand, eight hundred twenty-three".