171722320097 has 2 divisors, whose sum is σ = 171722320098. Its totient is φ = 171722320096.

The previous prime is 171722320087. The next prime is 171722320103. The reversal of 171722320097 is 790023227171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121636327696 + 50085992401 = 348764^2 + 223799^2 .

It is a cyclic number.

It is not a de Polignac number, because 171722320097 - 2⁸ = 171722319841 is a prime.

It is not a weakly prime, because it can be changed into another prime (171722320087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85861160048 + 85861160049.

It is an arithmetic number, because the mean of its divisors is an integer number (85861160049).

Almost surely, 2^171722320097 is an apocalyptic number.

It is an amenable number.

171722320097 is a deficient number, since it is larger than the sum of its proper divisors (1).

171722320097 is an equidigital number, since it uses as much as digits as its factorization.

171722320097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74088, while the sum is 41.

The spelling of 171722320097 in words is "one hundred seventy-one billion, seven hundred twenty-two million, three hundred twenty thousand, ninety-seven".