1268812091 has 2 divisors, whose sum is σ = 1268812092. Its totient is φ = 1268812090.

The previous prime is 1268812087. The next prime is 1268812157. The reversal of 1268812091 is 1902188621.

It is a weak prime.

It is an emirp because it is prime and its reverse (1902188621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1268812091 - 2² = 1268812087 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1268812591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634406045 + 634406046.

It is an arithmetic number, because the mean of its divisors is an integer number (634406046).

Almost surely, 2^1268812091 is an apocalyptic number.

1268812091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268812091 is an equidigital number, since it uses as much as digits as its factorization.

1268812091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 1268812091 is about 35620.3886980476. The cubic root of 1268812091 is about 1082.5943831926.

The spelling of 1268812091 in words is "one billion, two hundred sixty-eight million, eight hundred twelve thousand, ninety-one".