1231041013 has 2 divisors, whose sum is σ = 1231041014. Its totient is φ = 1231041012.

The previous prime is 1231040999. The next prime is 1231041047. The reversal of 1231041013 is 3101401321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 937706884 + 293334129 = 30622^2 + 17127^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231041013 - 2⁹ = 1231040501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231041913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615520506 + 615520507.

It is an arithmetic number, because the mean of its divisors is an integer number (615520507).

Almost surely, 2^1231041013 is an apocalyptic number.

It is an amenable number.

1231041013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231041013 is an equidigital number, since it uses as much as digits as its factorization.

1231041013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1231041013 is about 35086.1940512219. The cubic root of 1231041013 is about 1071.7434566201.

Adding to 1231041013 its reverse (3101401321), we get a palindrome (4332442334).

The spelling of 1231041013 in words is "one billion, two hundred thirty-one million, forty-one thousand, thirteen".