165311103 has 4 divisors (see below), whose sum is σ = 220414808. Its totient is φ = 110207400.

The previous prime is 165311099. The next prime is 165311119. The reversal of 165311103 is 301113561.

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

It is not a de Polignac number, because 165311103 - 2² = 165311099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165311103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165316103) 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, 27551848 + ... + 27551853.

It is an arithmetic number, because the mean of its divisors is an integer number (55103702).

Almost surely, 2^165311103 is an apocalyptic number.

165311103 is a deficient number, since it is larger than the sum of its proper divisors (55103705).

165311103 is an equidigital number, since it uses as much as digits as its factorization.

165311103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55103704.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 165311103 is about 12857.3365437792. The cubic root of 165311103 is about 548.8251539252.

Adding to 165311103 its reverse (301113561), we get a palindrome (466424664).

The spelling of 165311103 in words is "one hundred sixty-five million, three hundred eleven thousand, one hundred three".