171954286081 has 4 divisors (see below), whose sum is σ = 172383100164. Its totient is φ = 171525472000.

The previous prime is 171954286073. The next prime is 171954286099. The reversal of 171954286081 is 180682459171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180682459171 = 24197 ⋅7467143.

It can be written as a sum of positive squares in 2 ways, for example, as 125712084481 + 46242201600 = 354559^2 + 215040^2 .

It is a cyclic number.

It is not a de Polignac number, because 171954286081 - 2³ = 171954286073 is a prime.

It is a super-2 number, since 2×171954286081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171954286781) 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, 214406440 + ... + 214407241.

It is an arithmetic number, because the mean of its divisors is an integer number (43095775041).

Almost surely, 2^171954286081 is an apocalyptic number.

It is an amenable number.

171954286081 is a deficient number, since it is larger than the sum of its proper divisors (428814083).

171954286081 is an equidigital number, since it uses as much as digits as its factorization.

171954286081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428814082.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 171954286081 in words is "one hundred seventy-one billion, nine hundred fifty-four million, two hundred eighty-six thousand, eighty-one".