1263131281 has 2 divisors, whose sum is σ = 1263131282. Its totient is φ = 1263131280.

The previous prime is 1263131257. The next prime is 1263131339. The reversal of 1263131281 is 1821313621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 732243600 + 530887681 = 27060^2 + 23041^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263131281 - 2¹¹ = 1263129233 is a prime.

It is a super-2 number, since 2×1263131281² = 3191001266081401922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1263131201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631565640 + 631565641.

It is an arithmetic number, because the mean of its divisors is an integer number (631565641).

Almost surely, 2^1263131281 is an apocalyptic number.

It is an amenable number.

1263131281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263131281 is an equidigital number, since it uses as much as digits as its factorization.

1263131281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 1263131281 is about 35540.5582539160. The cubic root of 1263131281 is about 1080.9762779963.

The spelling of 1263131281 in words is "one billion, two hundred sixty-three million, one hundred thirty-one thousand, two hundred eighty-one".