1263143549 has 2 divisors, whose sum is σ = 1263143550. Its totient is φ = 1263143548.

The previous prime is 1263143513. The next prime is 1263143587. The reversal of 1263143549 is 9453413621.

It is an a-pointer prime, because the next prime (1263143587) can be obtained adding 1263143549 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 687383524 + 575760025 = 26218^2 + 23995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263143549 - 2²⁴ = 1246366333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263143599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631571774 + 631571775.

It is an arithmetic number, because the mean of its divisors is an integer number (631571775).

Almost surely, 2^1263143549 is an apocalyptic number.

It is an amenable number.

1263143549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263143549 is an equidigital number, since it uses as much as digits as its factorization.

1263143549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 1263143549 is about 35540.7308450459. The cubic root of 1263143549 is about 1080.9797775993.

The spelling of 1263143549 in words is "one billion, two hundred sixty-three million, one hundred forty-three thousand, five hundred forty-nine".