97181827513457 has 4 divisors (see below), whose sum is σ = 97181969936100. Its totient is φ = 97181685090816.

The previous prime is 97181827513409. The next prime is 97181827513567. The reversal of 97181827513457 is 75431572818179.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47108881415281 + 50072946098176 = 6863591^2 + 7076224^2 .

It is a cyclic number.

It is not a de Polignac number, because 97181827513457 - 2⁴⁰ = 96082315885681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97181827519457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70182848 + ... + 71554145.

It is an arithmetic number, because the mean of its divisors is an integer number (24295492484025).

Almost surely, 2^{97181827513457} is an apocalyptic number.

It is an amenable number.

97181827513457 is a deficient number, since it is larger than the sum of its proper divisors (142422643).

97181827513457 is a wasteful number, since it uses less digits than its factorization.

97181827513457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142422642.

The product of its digits is 118540800, while the sum is 68.

The spelling of 97181827513457 in words is "ninety-seven trillion, one hundred eighty-one billion, eight hundred twenty-seven million, five hundred thirteen thousand, four hundred fifty-seven".