28181511438841 has 2 divisors, whose sum is σ = 28181511438842. Its totient is φ = 28181511438840.

The previous prime is 28181511438833. The next prime is 28181511438887. The reversal of 28181511438841 is 14883411518182.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26789205837241 + 1392305601600 = 5175829^2 + 1179960^2 .

It is a cyclic number.

It is not a de Polignac number, because 28181511438841 - 2³ = 28181511438833 is a prime.

It is a super-2 number, since 2×28181511438841² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28181511435841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14090755719420 + 14090755719421.

It is an arithmetic number, because the mean of its divisors is an integer number (14090755719421).

Almost surely, 2^{28181511438841} is an apocalyptic number.

It is an amenable number.

28181511438841 is a deficient number, since it is larger than the sum of its proper divisors (1).

28181511438841 is an equidigital number, since it uses as much as digits as its factorization.

28181511438841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1966080, while the sum is 55.

The spelling of 28181511438841 in words is "twenty-eight trillion, one hundred eighty-one billion, five hundred eleven million, four hundred thirty-eight thousand, eight hundred forty-one".