1263563281 has 2 divisors, whose sum is σ = 1263563282. Its totient is φ = 1263563280.

The previous prime is 1263563261. The next prime is 1263563303. The reversal of 1263563281 is 1823653621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656384400 + 607178881 = 25620^2 + 24641^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263563281 - 2¹³ = 1263555089 is a prime.

It is a super-2 number, since 2×1263563281² = 3193184330182969922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1263563281.

It is not a weakly prime, because it can be changed into another prime (1263563221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631781640 + 631781641.

It is an arithmetic number, because the mean of its divisors is an integer number (631781641).

Almost surely, 2^1263563281 is an apocalyptic number.

It is an amenable number.

1263563281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263563281 is an equidigital number, since it uses as much as digits as its factorization.

1263563281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 1263563281 is about 35546.6352978731. The cubic root of 1263563281 is about 1081.0994978422.

The spelling of 1263563281 in words is "one billion, two hundred sixty-three million, five hundred sixty-three thousand, two hundred eighty-one".