171724961 has 4 divisors (see below), whose sum is σ = 172462212. Its totient is φ = 170987712.

The previous prime is 171724951. The next prime is 171724991. The reversal of 171724961 is 169427171.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64705936 + 107019025 = 8044^2 + 10345^2 .

It is a cyclic number.

It is not a de Polignac number, because 171724961 - 2⁶ = 171724897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (171724951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368276 + ... + 368741.

It is an arithmetic number, because the mean of its divisors is an integer number (43115553).

Almost surely, 2^171724961 is an apocalyptic number.

It is an amenable number.

171724961 is a deficient number, since it is larger than the sum of its proper divisors (737251).

171724961 is an equidigital number, since it uses as much as digits as its factorization.

171724961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737250.

The product of its digits is 21168, while the sum is 38.

The square root of 171724961 is about 13104.3870898261. The cubic root of 171724961 is about 555.8331894822.

The spelling of 171724961 in words is "one hundred seventy-one million, seven hundred twenty-four thousand, nine hundred sixty-one".