171994337321 has 2 divisors, whose sum is σ = 171994337322. Its totient is φ = 171994337320.

The previous prime is 171994337267. The next prime is 171994337329. The reversal of 171994337321 is 123733499171.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102359044096 + 69635293225 = 319936^2 + 263885^2 .

It is a cyclic number.

It is not a de Polignac number, because 171994337321 - 2⁶ = 171994337257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 171994337321.

It is not a weakly prime, because it can be changed into another prime (171994337329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85997168660 + 85997168661.

It is an arithmetic number, because the mean of its divisors is an integer number (85997168661).

Almost surely, 2^171994337321 is an apocalyptic number.

It is an amenable number.

171994337321 is a deficient number, since it is larger than the sum of its proper divisors (1).

171994337321 is an equidigital number, since it uses as much as digits as its factorization.

171994337321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 50.

The spelling of 171994337321 in words is "one hundred seventy-one billion, nine hundred ninety-four million, three hundred thirty-seven thousand, three hundred twenty-one".