165055139 has 4 divisors (see below), whose sum is σ = 165371256. Its totient is φ = 164739024.

The previous prime is 165055127. The next prime is 165055151. The reversal of 165055139 is 931550561.

It is a happy number.

165055139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931550561 = 2437 ⋅382253.

It is an interprime number because it is at equal distance from previous prime (165055127) and next prime (165055151).

It is a cyclic number.

It is not a de Polignac number, because 165055139 - 2⁴ = 165055123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165055099 and 165055108.

It is not an unprimeable number, because it can be changed into a prime (165055339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157274 + ... + 158319.

It is an arithmetic number, because the mean of its divisors is an integer number (41342814).

Almost surely, 2^165055139 is an apocalyptic number.

165055139 is a deficient number, since it is larger than the sum of its proper divisors (316117).

165055139 is an equidigital number, since it uses as much as digits as its factorization.

165055139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316116.

The product of its (nonzero) digits is 20250, while the sum is 35.

The square root of 165055139 is about 12847.3786820503. The cubic root of 165055139 is about 548.5417447517.

The spelling of 165055139 in words is "one hundred sixty-five million, fifty-five thousand, one hundred thirty-nine".