97511675039981 has 2 divisors, whose sum is σ = 97511675039982. Its totient is φ = 97511675039980.

The previous prime is 97511675039953. The next prime is 97511675040007. The reversal of 97511675039981 is 18993057611579.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86911057212100 + 10600617827881 = 9322610^2 + 3255859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97511675039981 is a prime.

It is a super-2 number, since 2×97511675039981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97511675039921) 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, 48755837519990 + 48755837519991.

It is an arithmetic number, because the mean of its divisors is an integer number (48755837519991).

Almost surely, 2^{97511675039981} is an apocalyptic number.

It is an amenable number.

97511675039981 is a deficient number, since it is larger than the sum of its proper divisors (1).

97511675039981 is an equidigital number, since it uses as much as digits as its factorization.

97511675039981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128595600, while the sum is 71.

The spelling of 97511675039981 in words is "ninety-seven trillion, five hundred eleven billion, six hundred seventy-five million, thirty-nine thousand, nine hundred eighty-one".