1263127849 has 2 divisors, whose sum is σ = 1263127850. Its totient is φ = 1263127848.

The previous prime is 1263127837. The next prime is 1263127883. The reversal of 1263127849 is 9487213621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1171829824 + 91298025 = 34232^2 + 9555^2 .

It is an emirp because it is prime and its reverse (9487213621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1263127849 - 2²⁷ = 1128910121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1263125849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631563924 + 631563925.

It is an arithmetic number, because the mean of its divisors is an integer number (631563925).

Almost surely, 2^1263127849 is an apocalyptic number.

It is an amenable number.

1263127849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263127849 is an equidigital number, since it uses as much as digits as its factorization.

1263127849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 1263127849 is about 35540.5099710176. The cubic root of 1263127849 is about 1080.9752989707.

The spelling of 1263127849 in words is "one billion, two hundred sixty-three million, one hundred twenty-seven thousand, eight hundred forty-nine".