1263885145 has 12 divisors (see below), whose sum is σ = 1611127404. Its totient is φ = 951630080.

The previous prime is 1263885067. The next prime is 1263885151. The reversal of 1263885145 is 5415883621.

It can be written as a sum of positive squares in 6 ways, for example, as 24000201 + 1239884944 = 4899^2 + 35212^2 .

It is not a de Polignac number, because 1263885145 - 2²¹ = 1261787993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435886 + ... + 438775.

It is an arithmetic number, because the mean of its divisors is an integer number (134260617).

Almost surely, 2^1263885145 is an apocalyptic number.

It is an amenable number.

1263885145 is a deficient number, since it is larger than the sum of its proper divisors (347242259).

1263885145 is an equidigital number, since it uses as much as digits as its factorization.

1263885145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874700 (or 874683 counting only the distinct ones).

The product of its digits is 230400, while the sum is 43.

The square root of 1263885145 is about 35551.1623579314. The cubic root of 1263885145 is about 1081.1912852165.

The spelling of 1263885145 in words is "one billion, two hundred sixty-three million, eight hundred eighty-five thousand, one hundred forty-five".