97444489921 has 3 divisors (see below), whose sum is σ = 97444802083. Its totient is φ = 97444177760.

The previous prime is 97444489811. The next prime is 97444489939. The reversal of 97444489921 is 12998444479.

The square root of 97444489921 is 312161.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12998444479 = 6803 ⋅1910693.

It can be written as a sum of positive squares in only one way, i.e., 93703944321 + 3740545600 = 306111^2 + 61160^2 .

It is not a de Polignac number, because 97444489921 - 2³⁵ = 63084751553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97444489921.

It is not an unprimeable number, because it can be changed into a prime (97444489981) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 156081 + ... + 468241.

Almost surely, 2^97444489921 is an apocalyptic number.

97444489921 is the 312161-st square number.

97444489921 is the 156081-st centered octagonal number.

It is an amenable number.

97444489921 is a deficient number, since it is larger than the sum of its proper divisors (312162).

97444489921 is an frugal number, since it uses more digits than its factorization.

97444489921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624322 (or 312161 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 61.

The spelling of 97444489921 in words is "ninety-seven billion, four hundred forty-four million, four hundred eighty-nine thousand, nine hundred twenty-one".