1268356997 has 2 divisors, whose sum is σ = 1268356998. Its totient is φ = 1268356996.

The previous prime is 1268356981. The next prime is 1268357039. The reversal of 1268356997 is 7996538621.

It is a happy number.

It is a Cunningham number, because it is equal to 35614²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1268356996 + 1 = 35614^2 + 1^2 .

It is an emirp because it is prime and its reverse (7996538621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1268356997 - 2⁴ = 1268356981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268356907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634178498 + 634178499.

It is an arithmetic number, because the mean of its divisors is an integer number (634178499).

Almost surely, 2^1268356997 is an apocalyptic number.

It is an amenable number.

1268356997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268356997 is an equidigital number, since it uses as much as digits as its factorization.

1268356997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 56.

The square root of 1268356997 is about 35614.0000140394. Note that the first 4 decimals coincide. The cubic root of 1268356997 is about 1082.4649337314.

The spelling of 1268356997 in words is "one billion, two hundred sixty-eight million, three hundred fifty-six thousand, nine hundred ninety-seven".