165313549 has 2 divisors, whose sum is σ = 165313550. Its totient is φ = 165313548.

The previous prime is 165313531. The next prime is 165313591. The reversal of 165313549 is 945313561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141372100 + 23941449 = 11890^2 + 4893^2 .

It is an emirp because it is prime and its reverse (945313561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165313549 - 2⁹ = 165313037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165313849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82656774 + 82656775.

It is an arithmetic number, because the mean of its divisors is an integer number (82656775).

Almost surely, 2^165313549 is an apocalyptic number.

It is an amenable number.

165313549 is a deficient number, since it is larger than the sum of its proper divisors (1).

165313549 is an equidigital number, since it uses as much as digits as its factorization.

165313549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 37.

The square root of 165313549 is about 12857.4316642166. The cubic root of 165313549 is about 548.8278607805.

The spelling of 165313549 in words is "one hundred sixty-five million, three hundred thirteen thousand, five hundred forty-nine".