1263222643 has 4 divisors (see below), whose sum is σ = 1263771568. Its totient is φ = 1262673720.

The previous prime is 1263222613. The next prime is 1263222647. The reversal of 1263222643 is 3462223621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1263222643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263222647) 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 in 3 ways as a sum of consecutive naturals, for example, 270996 + ... + 275617.

It is an arithmetic number, because the mean of its divisors is an integer number (315942892).

Almost surely, 2^1263222643 is an apocalyptic number.

1263222643 is a deficient number, since it is larger than the sum of its proper divisors (548925).

1263222643 is an equidigital number, since it uses as much as digits as its factorization.

1263222643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548924.

The product of its digits is 20736, while the sum is 31.

The square root of 1263222643 is about 35541.8435509471. The cubic root of 1263222643 is about 1081.0023396246.

The spelling of 1263222643 in words is "one billion, two hundred sixty-three million, two hundred twenty-two thousand, six hundred forty-three".