320135443 has 4 divisors (see below), whose sum is σ = 320386248. Its totient is φ = 319884640.

The previous prime is 320135429. The next prime is 320135467. The reversal of 320135443 is 344531023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344531023 = 599 ⋅575177.

It is a cyclic number.

It is not a de Polignac number, because 320135443 - 2⁵ = 320135411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320135743) 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, 123478 + ... + 126043.

It is an arithmetic number, because the mean of its divisors is an integer number (80096562).

Almost surely, 2^320135443 is an apocalyptic number.

320135443 is a deficient number, since it is larger than the sum of its proper divisors (250805).

320135443 is a wasteful number, since it uses less digits than its factorization.

320135443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250804.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 320135443 is about 17892.3291664333. The cubic root of 320135443 is about 684.0868668388.

Adding to 320135443 its reverse (344531023), we get a palindrome (664666466).

The spelling of 320135443 in words is "three hundred twenty million, one hundred thirty-five thousand, four hundred forty-three".