165609841 has 2 divisors, whose sum is σ = 165609842. Its totient is φ = 165609840.

The previous prime is 165609827. The next prime is 165609853. The reversal of 165609841 is 148906561.

165609841 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., 162817600 + 2792241 = 12760^2 + 1671^2 .

It is a cyclic number.

It is not a de Polignac number, because 165609841 - 2⁵ = 165609809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165609794 and 165609803.

It is not a weakly prime, because it can be changed into another prime (165609541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82804920 + 82804921.

It is an arithmetic number, because the mean of its divisors is an integer number (82804921).

Almost surely, 2^165609841 is an apocalyptic number.

It is an amenable number.

165609841 is a deficient number, since it is larger than the sum of its proper divisors (1).

165609841 is an equidigital number, since it uses as much as digits as its factorization.

165609841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 165609841 is about 12868.9487138616. The cubic root of 165609841 is about 549.1555537239.

The spelling of 165609841 in words is "one hundred sixty-five million, six hundred nine thousand, eight hundred forty-one".