171975641 has 2 divisors, whose sum is σ = 171975642. Its totient is φ = 171975640.

The previous prime is 171975571. The next prime is 171975647. The reversal of 171975641 is 146579171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147015625 + 24960016 = 12125^2 + 4996^2 .

It is a cyclic number.

It is not a de Polignac number, because 171975641 - 2¹⁸ = 171713497 is a prime.

It is not a weakly prime, because it can be changed into another prime (171975647) 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 as a sum of consecutive naturals, namely, 85987820 + 85987821.

It is an arithmetic number, because the mean of its divisors is an integer number (85987821).

Almost surely, 2^171975641 is an apocalyptic number.

It is an amenable number.

171975641 is a deficient number, since it is larger than the sum of its proper divisors (1).

171975641 is an equidigital number, since it uses as much as digits as its factorization.

171975641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 41.

The square root of 171975641 is about 13113.9483375527. The cubic root of 171975641 is about 556.1035219917.

The spelling of 171975641 in words is "one hundred seventy-one million, nine hundred seventy-five thousand, six hundred forty-one".