165544241 has 2 divisors, whose sum is σ = 165544242. Its totient is φ = 165544240.

The previous prime is 165544231. The next prime is 165544243. The reversal of 165544241 is 142445561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156150016 + 9394225 = 12496^2 + 3065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165544241 is a prime.

Together with 165544243, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 165544198 and 165544207.

It is not a weakly prime, because it can be changed into another prime (165544243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82772120 + 82772121.

It is an arithmetic number, because the mean of its divisors is an integer number (82772121).

Almost surely, 2^165544241 is an apocalyptic number.

It is an amenable number.

165544241 is a deficient number, since it is larger than the sum of its proper divisors (1).

165544241 is an equidigital number, since it uses as much as digits as its factorization.

165544241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 32.

The square root of 165544241 is about 12866.3996906672. The cubic root of 165544241 is about 549.0830351632.

The spelling of 165544241 in words is "one hundred sixty-five million, five hundred forty-four thousand, two hundred forty-one".