165521119 has 2 divisors, whose sum is σ = 165521120. Its totient is φ = 165521118.

The previous prime is 165521117. The next prime is 165521131. The reversal of 165521119 is 911125561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165521119 - 2¹ = 165521117 is a prime.

It is a super-2 number, since 2×165521119² = 54794481670024322, which contains 22 as substring.

Together with 165521117, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165521117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82760559 + 82760560.

It is an arithmetic number, because the mean of its divisors is an integer number (82760560).

Almost surely, 2^165521119 is an apocalyptic number.

165521119 is a deficient number, since it is larger than the sum of its proper divisors (1).

165521119 is an equidigital number, since it uses as much as digits as its factorization.

165521119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 31.

The square root of 165521119 is about 12865.5011173292. The cubic root of 165521119 is about 549.0574700151.

It can be divided in two parts, 16552 and 1119, that added together give a palindrome (17671).

The spelling of 165521119 in words is "one hundred sixty-five million, five hundred twenty-one thousand, one hundred nineteen".