13801881581 has 2 divisors, whose sum is σ = 13801881582. Its totient is φ = 13801881580.

The previous prime is 13801881563. The next prime is 13801881601. The reversal of 13801881581 is 18518810831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13388572681 + 413308900 = 115709^2 + 20330^2 .

It is an emirp because it is prime and its reverse (18518810831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13801881581 - 2⁶ = 13801881517 is a prime.

It is a super-2 number, since 2×13801881581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13801811581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6900940790 + 6900940791.

It is an arithmetic number, because the mean of its divisors is an integer number (6900940791).

Almost surely, 2^13801881581 is an apocalyptic number.

It is an amenable number.

13801881581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13801881581 is an equidigital number, since it uses as much as digits as its factorization.

13801881581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61440, while the sum is 44.

The spelling of 13801881581 in words is "thirteen billion, eight hundred one million, eight hundred eighty-one thousand, five hundred eighty-one".