165111481 has 2 divisors, whose sum is σ = 165111482. Its totient is φ = 165111480.

The previous prime is 165111461. The next prime is 165111521. The reversal of 165111481 is 184111561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94887081 + 70224400 = 9741^2 + 8380^2 .

It is an emirp because it is prime and its reverse (184111561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165111481 is a prime.

It is a super-2 number, since 2×165111481² = 54523602316026722, which contains 22 as substring.

It is equal to p_9244801 and since 165111481 and 9244801 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (165111431) 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, 82555740 + 82555741.

It is an arithmetic number, because the mean of its divisors is an integer number (82555741).

Almost surely, 2^165111481 is an apocalyptic number.

It is an amenable number.

165111481 is a deficient number, since it is larger than the sum of its proper divisors (1).

165111481 is an equidigital number, since it uses as much as digits as its factorization.

165111481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 28.

The square root of 165111481 is about 12849.5712379830. The cubic root of 165111481 is about 548.6041530338.

The spelling of 165111481 in words is "one hundred sixty-five million, one hundred eleven thousand, four hundred eighty-one".