973773981881 has 2 divisors, whose sum is σ = 973773981882. Its totient is φ = 973773981880.

The previous prime is 973773981811. The next prime is 973773981907. The reversal of 973773981881 is 188189377379.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 968689008400 + 5084973481 = 984220^2 + 71309^2 .

It is an emirp because it is prime and its reverse (188189377379) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-973773981881 is a prime.

It is a super-2 number, since 2×973773981881² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (973773981811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486886990940 + 486886990941.

It is an arithmetic number, because the mean of its divisors is an integer number (486886990941).

Almost surely, 2^973773981881 is an apocalyptic number.

It is an amenable number.

973773981881 is a deficient number, since it is larger than the sum of its proper divisors (1).

973773981881 is an equidigital number, since it uses as much as digits as its factorization.

973773981881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128024064, while the sum is 71.

The spelling of 973773981881 in words is "nine hundred seventy-three billion, seven hundred seventy-three million, nine hundred eighty-one thousand, eight hundred eighty-one".