97812278020081 has 3 divisors (see below), whose sum is σ = 97812287910091. Its totient is φ = 97812268130072.

The previous prime is 97812278020063. The next prime is 97812278020091. The reversal of 97812278020081 is 18002087221879.

The square root of 97812278020081 is 9890009.

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.

It can be written as a sum of positive squares in only one way, i.e., 93678375780081 + 4133902240000 = 9678759^2 + 2033200^2 .

It is not a de Polignac number, because 97812278020081 - 2⁹ = 97812278019569 is a prime.

It is a super-2 number, since 2×97812278020081² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97812278020091) 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, 4945005 + ... + 14835013.

Almost surely, 2^{97812278020081} is an apocalyptic number.

97812278020081 is the 9890009-th square number.

97812278020081 is the 4945005-th centered octagonal number.

It is an amenable number.

97812278020081 is a deficient number, since it is larger than the sum of its proper divisors (9890010).

97812278020081 is an frugal number, since it uses more digits than its factorization.

97812278020081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19780018 (or 9890009 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 55.

The spelling of 97812278020081 in words is "ninety-seven trillion, eight hundred twelve billion, two hundred seventy-eight million, twenty thousand, eighty-one".