311213222 has 4 divisors (see below), whose sum is σ = 466819836. Its totient is φ = 155606610.

The previous prime is 311213213. The next prime is 311213251. The reversal of 311213222 is 222312113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222312113 = 10607 ⋅20959.

It is a self number, because there is not a number n which added to its sum of digits gives 311213222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77803304 + ... + 77803307.

It is an arithmetic number, because the mean of its divisors is an integer number (116704959).

Almost surely, 2^311213222 is an apocalyptic number.

311213222 is a deficient number, since it is larger than the sum of its proper divisors (155606614).

311213222 is a wasteful number, since it uses less digits than its factorization.

311213222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155606613.

The product of its digits is 144, while the sum is 17.

The square root of 311213222 is about 17641.2364079165. The cubic root of 311213222 is about 677.6716953406.

Adding to 311213222 its reverse (222312113), we get a palindrome (533525335).

It can be divided in two parts, 31121 and 3222, that added together give a palindrome (34343).

The spelling of 311213222 in words is "three hundred eleven million, two hundred thirteen thousand, two hundred twenty-two".