165531241 has 2 divisors, whose sum is σ = 165531242. Its totient is φ = 165531240.

The previous prime is 165531203. The next prime is 165531251. The reversal of 165531241 is 142135561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107329600 + 58201641 = 10360^2 + 7629^2 .

It is a cyclic number.

It is not a de Polignac number, because 165531241 - 2¹¹ = 165529193 is a prime.

It is not a weakly prime, because it can be changed into another prime (165531251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82765620 + 82765621.

It is an arithmetic number, because the mean of its divisors is an integer number (82765621).

Almost surely, 2^165531241 is an apocalyptic number.

It is an amenable number.

165531241 is a deficient number, since it is larger than the sum of its proper divisors (1).

165531241 is an equidigital number, since it uses as much as digits as its factorization.

165531241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 165531241 is about 12865.8944889191. The cubic root of 165531241 is about 549.0686618326.

It can be divided in two parts, 1655 and 31241, that added together give a triangular number (32896 = T₂₅₆).

The spelling of 165531241 in words is "one hundred sixty-five million, five hundred thirty-one thousand, two hundred forty-one".