311111321 has 8 divisors (see below), whose sum is σ = 326112864. Its totient is φ = 296462880.

The previous prime is 311111309. The next prime is 311111347. The reversal of 311111321 is 123111113.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311111321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311111296 and 311111305.

It is not an unprimeable number, because it can be changed into a prime (311111621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86471 + ... + 89996.

It is an arithmetic number, because the mean of its divisors is an integer number (40764108).

Almost surely, 2^311111321 is an apocalyptic number.

It is an amenable number.

311111321 is a deficient number, since it is larger than the sum of its proper divisors (15001543).

311111321 is a wasteful number, since it uses less digits than its factorization.

311111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176551.

The product of its digits is 18, while the sum is 14.

The square root of 311111321 is about 17638.3480235537. The cubic root of 311111321 is about 677.5977235887.

Adding to 311111321 its reverse (123111113), we get a palindrome (434222434).

The spelling of 311111321 in words is "three hundred eleven million, one hundred eleven thousand, three hundred twenty-one".