165221519 has 2 divisors, whose sum is σ = 165221520. Its totient is φ = 165221518.

The previous prime is 165221501. The next prime is 165221533. The reversal of 165221519 is 915122561.

165221519 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 is an emirp because it is prime and its reverse (915122561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165221519 is a prime.

It is a super-2 number, since 2×165221519² = 54596300681334722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165221569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82610759 + 82610760.

It is an arithmetic number, because the mean of its divisors is an integer number (82610760).

Almost surely, 2^165221519 is an apocalyptic number.

165221519 is a deficient number, since it is larger than the sum of its proper divisors (1).

165221519 is an equidigital number, since it uses as much as digits as its factorization.

165221519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 32.

The square root of 165221519 is about 12853.8523019366. The cubic root of 165221519 is about 548.7259977775.

The spelling of 165221519 in words is "one hundred sixty-five million, two hundred twenty-one thousand, five hundred nineteen".