1266123101 has 2 divisors, whose sum is σ = 1266123102. Its totient is φ = 1266123100.

The previous prime is 1266123073. The next prime is 1266123107. The reversal of 1266123101 is 1013216621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1128624025 + 137499076 = 33595^2 + 11726^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266123101 - 2⁶ = 1266123037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266123107) 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, 633061550 + 633061551.

It is an arithmetic number, because the mean of its divisors is an integer number (633061551).

Almost surely, 2^1266123101 is an apocalyptic number.

It is an amenable number.

1266123101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266123101 is an equidigital number, since it uses as much as digits as its factorization.

1266123101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1266123101 is about 35582.6235823049. The cubic root of 1266123101 is about 1081.8290625169.

Adding to 1266123101 its reverse (1013216621), we get a palindrome (2279339722).

The spelling of 1266123101 in words is "one billion, two hundred sixty-six million, one hundred twenty-three thousand, one hundred one".