97990071761 has 2 divisors, whose sum is σ = 97990071762. Its totient is φ = 97990071760.

The previous prime is 97990071749. The next prime is 97990071811. The reversal of 97990071761 is 16717009979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96950654161 + 1039417600 = 311369^2 + 32240^2 .

It is an emirp because it is prime and its reverse (16717009979) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97990071761 is a prime.

It is a super-2 number, since 2×97990071761² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 97990071697 and 97990071706.

It is not a weakly prime, because it can be changed into another prime (97990071701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48995035880 + 48995035881.

It is an arithmetic number, because the mean of its divisors is an integer number (48995035881).

Almost surely, 2^97990071761 is an apocalyptic number.

It is an amenable number.

97990071761 is a deficient number, since it is larger than the sum of its proper divisors (1).

97990071761 is an equidigital number, since it uses as much as digits as its factorization.

97990071761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500282, while the sum is 56.

The spelling of 97990071761 in words is "ninety-seven billion, nine hundred ninety million, seventy-one thousand, seven hundred sixty-one".