171588661 has 2 divisors, whose sum is σ = 171588662. Its totient is φ = 171588660.

The previous prime is 171588643. The next prime is 171588673. The reversal of 171588661 is 166885171.

171588661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171112561 + 476100 = 13081^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 171588661 - 2⁵ = 171588629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171588061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85794330 + 85794331.

It is an arithmetic number, because the mean of its divisors is an integer number (85794331).

Almost surely, 2^171588661 is an apocalyptic number.

It is an amenable number.

171588661 is a deficient number, since it is larger than the sum of its proper divisors (1).

171588661 is an equidigital number, since it uses as much as digits as its factorization.

171588661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 43.

The square root of 171588661 is about 13099.1855090307. The cubic root of 171588661 is about 555.6860935757.

The spelling of 171588661 in words is "one hundred seventy-one million, five hundred eighty-eight thousand, six hundred sixty-one".