171047561 has 4 divisors (see below), whose sum is σ = 173212800. Its totient is φ = 168882324.

The previous prime is 171047551. The next prime is 171047563. The reversal of 171047561 is 165740171.

171047561 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.

It is a cyclic number.

It is not a de Polignac number, because 171047561 - 2⁶ = 171047497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171047563) 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, 1082501 + ... + 1082658.

It is an arithmetic number, because the mean of its divisors is an integer number (43303200).

Almost surely, 2^171047561 is an apocalyptic number.

It is an amenable number.

171047561 is a deficient number, since it is larger than the sum of its proper divisors (2165239).

171047561 is an equidigital number, since it uses as much as digits as its factorization.

171047561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165238.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 171047561 is about 13078.5152444763. The cubic root of 171047561 is about 555.1013650313.

The spelling of 171047561 in words is "one hundred seventy-one million, forty-seven thousand, five hundred sixty-one".