165124121 has 2 divisors, whose sum is σ = 165124122. Its totient is φ = 165124120.

The previous prime is 165124109. The next prime is 165124123. The reversal of 165124121 is 121421561.

165124121 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., 84842521 + 80281600 = 9211^2 + 8960^2 .

It is a cyclic number.

It is not a de Polignac number, because 165124121 - 2²² = 160929817 is a prime.

Together with 165124123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165124123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82562060 + 82562061.

It is an arithmetic number, because the mean of its divisors is an integer number (82562061).

Almost surely, 2^165124121 is an apocalyptic number.

It is an amenable number.

165124121 is a deficient number, since it is larger than the sum of its proper divisors (1).

165124121 is an equidigital number, since it uses as much as digits as its factorization.

165124121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 165124121 is about 12850.0630737752. The cubic root of 165124121 is about 548.6181520191.

Adding to 165124121 its reverse (121421561), we get a palindrome (286545682).

The spelling of 165124121 in words is "one hundred sixty-five million, one hundred twenty-four thousand, one hundred twenty-one".