1263441013 has 4 divisors (see below), whose sum is σ = 1263512140. Its totient is φ = 1263369888.

The previous prime is 1263440993. The next prime is 1263441019. The reversal of 1263441013 is 3101443621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3101443621 = 27551 ⋅112571.

It can be written as a sum of positive squares in 2 ways, for example, as 234763684 + 1028677329 = 15322^2 + 32073^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263441013 - 2⁹ = 1263440501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263441019) 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, 16081 + ... + 52777.

It is an arithmetic number, because the mean of its divisors is an integer number (315878035).

Almost surely, 2^1263441013 is an apocalyptic number.

It is an amenable number.

1263441013 is a deficient number, since it is larger than the sum of its proper divisors (71127).

1263441013 is an equidigital number, since it uses as much as digits as its factorization.

1263441013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71126.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1263441013 is about 35544.9154310430. The cubic root of 1263441013 is about 1081.0646260530.

Adding to 1263441013 its reverse (3101443621), we get a palindrome (4364884634).

The spelling of 1263441013 in words is "one billion, two hundred sixty-three million, four hundred forty-one thousand, thirteen".