1263957643 has 4 divisors (see below), whose sum is σ = 1361185168. Its totient is φ = 1166730120.

The previous prime is 1263957641. The next prime is 1263957647. The reversal of 1263957643 is 3467593621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3467593621 = 4201 ⋅825421.

It is a cyclic number.

It is not a de Polignac number, because 1263957643 - 2¹ = 1263957641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1263957593 and 1263957602.

It is not an unprimeable number, because it can be changed into a prime (1263957641) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 48613743 + ... + 48613768.

It is an arithmetic number, because the mean of its divisors is an integer number (340296292).

Almost surely, 2^1263957643 is an apocalyptic number.

1263957643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1263957643 is a deficient number, since it is larger than the sum of its proper divisors (97227525).

1263957643 is an equidigital number, since it uses as much as digits as its factorization.

1263957643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97227524.

The product of its digits is 816480, while the sum is 46.

The square root of 1263957643 is about 35552.1819724191. The cubic root of 1263957643 is about 1081.2119576400.

The spelling of 1263957643 in words is "one billion, two hundred sixty-three million, nine hundred fifty-seven thousand, six hundred forty-three".