320144155 has 4 divisors (see below), whose sum is σ = 384172992. Its totient is φ = 256115320.

The previous prime is 320144147. The next prime is 320144173. The reversal of 320144155 is 551441023.

It is a happy number.

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

It is not a de Polignac number, because 320144155 - 2³ = 320144147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32014411 + ... + 32014420.

It is an arithmetic number, because the mean of its divisors is an integer number (96043248).

Almost surely, 2^320144155 is an apocalyptic number.

320144155 is a deficient number, since it is larger than the sum of its proper divisors (64028837).

320144155 is an equidigital number, since it uses as much as digits as its factorization.

320144155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64028836.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 320144155 is about 17892.5726210626. The cubic root of 320144155 is about 684.0930722444.

Adding to 320144155 its reverse (551441023), we get a palindrome (871585178).

The spelling of 320144155 in words is "three hundred twenty million, one hundred forty-four thousand, one hundred fifty-five".