7173875981 has 2 divisors, whose sum is σ = 7173875982. Its totient is φ = 7173875980.

The previous prime is 7173875963. The next prime is 7173876007. The reversal of 7173875981 is 1895783717.

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., 5260600900 + 1913275081 = 72530^2 + 43741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7173875981 is a prime.

It is a super-2 number, since 2×7173875981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7173875381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3586937990 + 3586937991.

It is an arithmetic number, because the mean of its divisors is an integer number (3586937991).

Almost surely, 2^7173875981 is an apocalyptic number.

It is an amenable number.

7173875981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7173875981 is an equidigital number, since it uses as much as digits as its factorization.

7173875981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2963520, while the sum is 56.

The square root of 7173875981 is about 84698.7365962445. The cubic root of 7173875981 is about 1928.6405257059.

The spelling of 7173875981 in words is "seven billion, one hundred seventy-three million, eight hundred seventy-five thousand, nine hundred eighty-one".