171367090721 has 2 divisors, whose sum is σ = 171367090722. Its totient is φ = 171367090720.

The previous prime is 171367090639. The next prime is 171367090723. The reversal of 171367090721 is 127090763171.

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., 167858187025 + 3508903696 = 409705^2 + 59236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171367090721 is a prime.

Together with 171367090723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (171367090723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85683545360 + 85683545361.

It is an arithmetic number, because the mean of its divisors is an integer number (85683545361).

Almost surely, 2^171367090721 is an apocalyptic number.

It is an amenable number.

171367090721 is a deficient number, since it is larger than the sum of its proper divisors (1).

171367090721 is an equidigital number, since it uses as much as digits as its factorization.

171367090721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111132, while the sum is 44.

The spelling of 171367090721 in words is "one hundred seventy-one billion, three hundred sixty-seven million, ninety thousand, seven hundred twenty-one".