320111111 has 4 divisors (see below), whose sum is σ = 322028112. Its totient is φ = 318194112.

The previous prime is 320111101. The next prime is 320111123. The reversal of 320111111 is 111111023.

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 320111111 - 2¹⁸ = 319848967 is a prime.

It is a super-2 number, since 2×320111111² = 204942246771308642, which contains 22 as substring.

It is a Duffinian number.

320111111 is a modest number, since divided by 11111 gives 3201 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 320111092 and 320111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320111101) 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, 958250 + ... + 958583.

It is an arithmetic number, because the mean of its divisors is an integer number (80507028).

Almost surely, 2^320111111 is an apocalyptic number.

320111111 is a deficient number, since it is larger than the sum of its proper divisors (1917001).

320111111 is a wasteful number, since it uses less digits than its factorization.

320111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917000.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 320111111 is about 17891.6491973211. The cubic root of 320111111 is about 684.0695349837.

Adding to 320111111 its reverse (111111023), we get a palindrome (431222134).

The spelling of 320111111 in words is "three hundred twenty million, one hundred eleven thousand, one hundred eleven".