2028171973 has 2 divisors, whose sum is σ = 2028171974. Its totient is φ = 2028171972.

The previous prime is 2028171919. The next prime is 2028171979. The reversal of 2028171973 is 3791718202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1021569444 + 1006602529 = 31962^2 + 31727^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2028171973 is a prime.

It is a super-2 number, since 2×2028171973² = 8226963104125425458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2028171979) 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, 1014085986 + 1014085987.

It is an arithmetic number, because the mean of its divisors is an integer number (1014085987).

Almost surely, 2^2028171973 is an apocalyptic number.

It is an amenable number.

2028171973 is a deficient number, since it is larger than the sum of its proper divisors (1).

2028171973 is an equidigital number, since it uses as much as digits as its factorization.

2028171973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 2028171973 is about 45035.2303535799. The cubic root of 2028171973 is about 1265.8092325114.

The spelling of 2028171973 in words is "two billion, twenty-eight million, one hundred seventy-one thousand, nine hundred seventy-three".