97444489981 has 2 divisors, whose sum is σ = 97444489982. Its totient is φ = 97444489980.

The previous prime is 97444489979. The next prime is 97444490009. The reversal of 97444489981 is 18998444479.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57787352100 + 39657137881 = 240390^2 + 199141^2 .

It is a cyclic number.

It is not a de Polignac number, because 97444489981 - 2¹ = 97444489979 is a prime.

It is a super-2 number, since 2×97444489981² (a number of 23 digits) contains 22 as substring.

Together with 97444489979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97444489081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48722244990 + 48722244991.

It is an arithmetic number, because the mean of its divisors is an integer number (48722244991).

Almost surely, 2^97444489981 is an apocalyptic number.

It is an amenable number.

97444489981 is a deficient number, since it is larger than the sum of its proper divisors (1).

97444489981 is an equidigital number, since it uses as much as digits as its factorization.

97444489981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 83607552, while the sum is 67.

The spelling of 97444489981 in words is "ninety-seven billion, four hundred forty-four million, four hundred eighty-nine thousand, nine hundred eighty-one".