1263161279 has 2 divisors, whose sum is σ = 1263161280. Its totient is φ = 1263161278.

The previous prime is 1263161239. The next prime is 1263161281. The reversal of 1263161279 is 9721613621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1263161279 - 2²⁴ = 1246384063 is a prime.

Together with 1263161281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263161239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631580639 + 631580640.

It is an arithmetic number, because the mean of its divisors is an integer number (631580640).

Almost surely, 2^1263161279 is an apocalyptic number.

1263161279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263161279 is an equidigital number, since it uses as much as digits as its factorization.

1263161279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 1263161279 is about 35540.9802762951. The cubic root of 1263161279 is about 1080.9848352673.

The spelling of 1263161279 in words is "one billion, two hundred sixty-three million, one hundred sixty-one thousand, two hundred seventy-nine".