1239540013 has 2 divisors, whose sum is σ = 1239540014. Its totient is φ = 1239540012.

The previous prime is 1239539881. The next prime is 1239540017. The reversal of 1239540013 is 3100459321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1069159204 + 170380809 = 32698^2 + 13053^2 .

It is a cyclic number.

It is not a de Polignac number, because 1239540013 - 2⁹ = 1239539501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1239540017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619770006 + 619770007.

It is an arithmetic number, because the mean of its divisors is an integer number (619770007).

Almost surely, 2^1239540013 is an apocalyptic number.

It is an amenable number.

1239540013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239540013 is an equidigital number, since it uses as much as digits as its factorization.

1239540013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1239540013 is about 35207.1017409840. The cubic root of 1239540013 is about 1074.2042101810.

Adding to 1239540013 its reverse (3100459321), we get a palindrome (4339999334).

The spelling of 1239540013 in words is "one billion, two hundred thirty-nine million, five hundred forty thousand, thirteen".