165034381 has 2 divisors, whose sum is σ = 165034382. Its totient is φ = 165034380.

The previous prime is 165034379. The next prime is 165034409. The reversal of 165034381 is 183430561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89605156 + 75429225 = 9466^2 + 8685^2 .

It is a cyclic number.

It is not a de Polignac number, because 165034381 - 2¹ = 165034379 is a prime.

It is a super-2 number, since 2×165034381² = 54472693824106322, which contains 22 as substring.

Together with 165034379, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is equal to p_9240754 and since 165034381 and 9240754 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165034781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82517190 + 82517191.

It is an arithmetic number, because the mean of its divisors is an integer number (82517191).

Almost surely, 2^165034381 is an apocalyptic number.

It is an amenable number.

165034381 is a deficient number, since it is larger than the sum of its proper divisors (1).

165034381 is an equidigital number, since it uses as much as digits as its factorization.

165034381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 165034381 is about 12846.5707875682. The cubic root of 165034381 is about 548.5187481802.

The spelling of 165034381 in words is "one hundred sixty-five million, thirty-four thousand, three hundred eighty-one".