1263534243 has 4 divisors (see below), whose sum is σ = 1684712328. Its totient is φ = 842356160.

The previous prime is 1263534241. The next prime is 1263534253. The reversal of 1263534243 is 3424353621.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1263534243 - 2¹ = 1263534241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1263534241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210589038 + ... + 210589043.

It is an arithmetic number, because the mean of its divisors is an integer number (421178082).

Almost surely, 2^1263534243 is an apocalyptic number.

1263534243 is a deficient number, since it is larger than the sum of its proper divisors (421178085).

1263534243 is an equidigital number, since it uses as much as digits as its factorization.

1263534243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421178084.

The product of its digits is 51840, while the sum is 33.

The square root of 1263534243 is about 35546.2268461788. The cubic root of 1263534243 is about 1081.0912161813.

Adding to 1263534243 its reverse (3424353621), we get a palindrome (4687887864).

The spelling of 1263534243 in words is "one billion, two hundred sixty-three million, five hundred thirty-four thousand, two hundred forty-three".