13504500439861 has 2 divisors, whose sum is σ = 13504500439862. Its totient is φ = 13504500439860.

The previous prime is 13504500439799. The next prime is 13504500439867. The reversal of 13504500439861 is 16893400540531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9035398739236 + 4469101700625 = 3005894^2 + 2114025^2 .

It is an emirp because it is prime and its reverse (16893400540531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13504500439861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13504500439867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6752250219930 + 6752250219931.

It is an arithmetic number, because the mean of its divisors is an integer number (6752250219931).

Almost surely, 2^{13504500439861} is an apocalyptic number.

It is an amenable number.

13504500439861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13504500439861 is an equidigital number, since it uses as much as digits as its factorization.

13504500439861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 13504500439861 in words is "thirteen trillion, five hundred four billion, five hundred million, four hundred thirty-nine thousand, eight hundred sixty-one".