165231103 has 4 divisors (see below), whose sum is σ = 172415088. Its totient is φ = 158047120.

The previous prime is 165231097. The next prime is 165231113. The reversal of 165231103 is 301132561.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 165231103 - 2²¹ = 163133951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165231113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3591958 + ... + 3592003.

It is an arithmetic number, because the mean of its divisors is an integer number (43103772).

Almost surely, 2^165231103 is an apocalyptic number.

165231103 is a deficient number, since it is larger than the sum of its proper divisors (7183985).

165231103 is an equidigital number, since it uses as much as digits as its factorization.

165231103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7183984.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 165231103 is about 12854.2251030546. The cubic root of 165231103 is about 548.7366075502.

Adding to 165231103 its reverse (301132561), we get a palindrome (466363664).

The spelling of 165231103 in words is "one hundred sixty-five million, two hundred thirty-one thousand, one hundred three".