311221422 has 12 divisors (see below), whose sum is σ = 674313120. Its totient is φ = 103740468.

The previous prime is 311221403. The next prime is 311221423. The reversal of 311221422 is 224122113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 17290079 = 311221422 / (3 + 1 + 1 + 2 + 2 + 1 + 4 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 311221395 and 311221404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311221423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8645022 + ... + 8645057.

It is an arithmetic number, because the mean of its divisors is an integer number (56192760).

Almost surely, 2^311221422 is an apocalyptic number.

311221422 is an abundant number, since it is smaller than the sum of its proper divisors (363091698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311221422 is a wasteful number, since it uses less digits than its factorization.

311221422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17290087 (or 17290084 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 311221422 is about 17641.4688163996. The cubic root of 311221422 is about 677.6776471647.

Adding to 311221422 its reverse (224122113), we get a palindrome (535343535).

The spelling of 311221422 in words is "three hundred eleven million, two hundred twenty-one thousand, four hundred twenty-two".