173728826981 has 2 divisors, whose sum is σ = 173728826982. Its totient is φ = 173728826980.

The previous prime is 173728826963. The next prime is 173728827047. The reversal of 173728826981 is 189628827371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140943930625 + 32784896356 = 375425^2 + 181066^2 .

It is a cyclic number.

It is not a de Polignac number, because 173728826981 - 2¹⁴ = 173728810597 is a prime.

It is a super-2 number, since 2×173728826981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173728826281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86864413490 + 86864413491.

It is an arithmetic number, because the mean of its divisors is an integer number (86864413491).

Almost surely, 2^173728826981 is an apocalyptic number.

It is an amenable number.

173728826981 is a deficient number, since it is larger than the sum of its proper divisors (1).

173728826981 is an equidigital number, since it uses as much as digits as its factorization.

173728826981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16257024, while the sum is 62.

The spelling of 173728826981 in words is "one hundred seventy-three billion, seven hundred twenty-eight million, eight hundred twenty-six thousand, nine hundred eighty-one".