171193661 has 4 divisors (see below), whose sum is σ = 171387552. Its totient is φ = 170999772.

The previous prime is 171193637. The next prime is 171193663. The reversal of 171193661 is 166391171.

171193661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166391171 = 229 ⋅726599.

It is a cyclic number.

It is not a de Polignac number, because 171193661 - 2¹⁴ = 171177277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171193663) 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, 95615 + ... + 97388.

It is an arithmetic number, because the mean of its divisors is an integer number (42846888).

Almost surely, 2^171193661 is an apocalyptic number.

It is an amenable number.

171193661 is a deficient number, since it is larger than the sum of its proper divisors (193891).

171193661 is an equidigital number, since it uses as much as digits as its factorization.

171193661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193890.

The product of its digits is 6804, while the sum is 35.

The square root of 171193661 is about 13084.0995486889. The cubic root of 171193661 is about 555.2593663680.

The spelling of 171193661 in words is "one hundred seventy-one million, one hundred ninety-three thousand, six hundred sixty-one".