3947980523173 has 2 divisors, whose sum is σ = 3947980523174. Its totient is φ = 3947980523172.

The previous prime is 3947980523167. The next prime is 3947980523197. The reversal of 3947980523173 is 3713250897493.

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., 2844056263489 + 1103924259684 = 1686433^2 + 1050678^2 .

It is an emirp because it is prime and its reverse (3713250897493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3947980523173 is a prime.

It is a super-2 number, since 2×3947980523173² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3947980523273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1973990261586 + 1973990261587.

It is an arithmetic number, because the mean of its divisors is an integer number (1973990261587).

Almost surely, 2^{3947980523173} is an apocalyptic number.

It is an amenable number.

3947980523173 is a deficient number, since it is larger than the sum of its proper divisors (1).

3947980523173 is an equidigital number, since it uses as much as digits as its factorization.

3947980523173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34292160, while the sum is 61.

The spelling of 3947980523173 in words is "three trillion, nine hundred forty-seven billion, nine hundred eighty million, five hundred twenty-three thousand, one hundred seventy-three".