1266260251 has 2 divisors, whose sum is σ = 1266260252. Its totient is φ = 1266260250.

The previous prime is 1266260207. The next prime is 1266260273. The reversal of 1266260251 is 1520626621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1266260251 - 2¹⁹ = 1265735963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266260291) 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, 633130125 + 633130126.

It is an arithmetic number, because the mean of its divisors is an integer number (633130126).

Almost surely, 2^1266260251 is an apocalyptic number.

1266260251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266260251 is an equidigital number, since it uses as much as digits as its factorization.

1266260251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1266260251 is about 35584.5507348344. The cubic root of 1266260251 is about 1081.8681233578.

Adding to 1266260251 its reverse (1520626621), we get a palindrome (2786886872).

The spelling of 1266260251 in words is "one billion, two hundred sixty-six million, two hundred sixty thousand, two hundred fifty-one".