97800021173 has 4 divisors (see below), whose sum is σ = 98306757228. Its totient is φ = 97293285120.

The previous prime is 97800021133. The next prime is 97800021199. The reversal of 97800021173 is 37112000879.

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 34574427364 + 63225593809 = 185942^2 + 251447^2 .

It is a cyclic number.

It is not a de Polignac number, because 97800021173 - 2⁸ = 97800020917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97800021133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253367738 + ... + 253368123.

It is an arithmetic number, because the mean of its divisors is an integer number (24576689307).

Almost surely, 2^97800021173 is an apocalyptic number.

It is an amenable number.

97800021173 is a deficient number, since it is larger than the sum of its proper divisors (506736055).

97800021173 is a wasteful number, since it uses less digits than its factorization.

97800021173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506736054.

The product of its (nonzero) digits is 21168, while the sum is 38.

The spelling of 97800021173 in words is "ninety-seven billion, eight hundred million, twenty-one thousand, one hundred seventy-three".