165541513 has 4 divisors (see below), whose sum is σ = 167401620. Its totient is φ = 163681408.

The previous prime is 165541507. The next prime is 165541531. The reversal of 165541513 is 315145561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51222649 + 114318864 = 7157^2 + 10692^2 .

It is a cyclic number.

It is not a de Polignac number, because 165541513 - 2⁹ = 165541001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165541543) 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 in 3 ways as a sum of consecutive naturals, for example, 929920 + ... + 930097.

It is an arithmetic number, because the mean of its divisors is an integer number (41850405).

Almost surely, 2^165541513 is an apocalyptic number.

It is an amenable number.

165541513 is a deficient number, since it is larger than the sum of its proper divisors (1860107).

165541513 is an equidigital number, since it uses as much as digits as its factorization.

165541513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860106.

The product of its digits is 9000, while the sum is 31.

The square root of 165541513 is about 12866.2936776680. The cubic root of 165541513 is about 549.0800190374.

The spelling of 165541513 in words is "one hundred sixty-five million, five hundred forty-one thousand, five hundred thirteen".