311213111 has 4 divisors (see below), whose sum is σ = 339505224. Its totient is φ = 282921000.

The previous prime is 311213107. The next prime is 311213113. The reversal of 311213111 is 111312113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111312113 = 11 ⋅10119283.

It is a cyclic number.

It is not a de Polignac number, because 311213111 - 2² = 311213107 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 (311213113) 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, 14146040 + ... + 14146061.

It is an arithmetic number, because the mean of its divisors is an integer number (84876306).

Almost surely, 2^311213111 is an apocalyptic number.

311213111 is a deficient number, since it is larger than the sum of its proper divisors (28292113).

311213111 is a wasteful number, since it uses less digits than its factorization.

311213111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28292112.

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

The square root of 311213111 is about 17641.2332618783. The cubic root of 311213111 is about 677.6716147725.

Adding to 311213111 its reverse (111312113), we get a palindrome (422525224).

The spelling of 311213111 in words is "three hundred eleven million, two hundred thirteen thousand, one hundred eleven".