28173184381 has 2 divisors, whose sum is σ = 28173184382. Its totient is φ = 28173184380.

The previous prime is 28173184367. The next prime is 28173184387. The reversal of 28173184381 is 18348137182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17965113156 + 10208071225 = 134034^2 + 101035^2 .

It is a cyclic number.

It is not a de Polignac number, because 28173184381 - 2⁷ = 28173184253 is a prime.

It is a super-2 number, since 2×28173184381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28173184387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14086592190 + 14086592191.

It is an arithmetic number, because the mean of its divisors is an integer number (14086592191).

Almost surely, 2^28173184381 is an apocalyptic number.

It is an amenable number.

28173184381 is a deficient number, since it is larger than the sum of its proper divisors (1).

28173184381 is an equidigital number, since it uses as much as digits as its factorization.

28173184381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 46.

The spelling of 28173184381 in words is "twenty-eight billion, one hundred seventy-three million, one hundred eighty-four thousand, three hundred eighty-one".