1263243049 has 4 divisors (see below), whose sum is σ = 1265154820. Its totient is φ = 1261331280.

The previous prime is 1263243043. The next prime is 1263243067. The reversal of 1263243049 is 9403423621.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 856615824 + 406627225 = 29268^2 + 20165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263243049 - 2⁷ = 1263242921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263243043) 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, 954894 + ... + 956215.

It is an arithmetic number, because the mean of its divisors is an integer number (316288705).

Almost surely, 2^1263243049 is an apocalyptic number.

It is an amenable number.

1263243049 is a deficient number, since it is larger than the sum of its proper divisors (1911771).

1263243049 is an equidigital number, since it uses as much as digits as its factorization.

1263243049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911770.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 1263243049 is about 35542.1306198714. The cubic root of 1263243049 is about 1081.0081604024.

The spelling of 1263243049 in words is "one billion, two hundred sixty-three million, two hundred forty-three thousand, forty-nine".