1268691253 has 2 divisors, whose sum is σ = 1268691254. Its totient is φ = 1268691252.

The previous prime is 1268691251. The next prime is 1268691311. The reversal of 1268691253 is 3521968621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 913067089 + 355624164 = 30217^2 + 18858^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268691253 - 2¹ = 1268691251 is a prime.

Together with 1268691251, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268691251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634345626 + 634345627.

It is an arithmetic number, because the mean of its divisors is an integer number (634345627).

Almost surely, 2^1268691253 is an apocalyptic number.

It is an amenable number.

1268691253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268691253 is an equidigital number, since it uses as much as digits as its factorization.

1268691253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 1268691253 is about 35618.6924661757. The cubic root of 1268691253 is about 1082.5600143804.

The spelling of 1268691253 in words is "one billion, two hundred sixty-eight million, six hundred ninety-one thousand, two hundred fifty-three".