97711549421 has 2 divisors, whose sum is σ = 97711549422. Its totient is φ = 97711549420.

The previous prime is 97711549391. The next prime is 97711549423. The reversal of 97711549421 is 12494511779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60157372900 + 37554176521 = 245270^2 + 193789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97711549421 is a prime.

Together with 97711549423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97711549421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97711549423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48855774710 + 48855774711.

It is an arithmetic number, because the mean of its divisors is an integer number (48855774711).

Almost surely, 2^97711549421 is an apocalyptic number.

It is an amenable number.

97711549421 is a deficient number, since it is larger than the sum of its proper divisors (1).

97711549421 is an equidigital number, since it uses as much as digits as its factorization.

97711549421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 50.

The spelling of 97711549421 in words is "ninety-seven billion, seven hundred eleven million, five hundred forty-nine thousand, four hundred twenty-one".