311221442 has 24 divisors (see below), whose sum is σ = 546409296. Its totient is φ = 132555528.

The previous prime is 311221423. The next prime is 311221453. The reversal of 311221442 is 244122113.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6233 + ... + 25715.

It is an arithmetic number, because the mean of its divisors is an integer number (22767054).

Almost surely, 2^311221442 is an apocalyptic number.

311221442 is a deficient number, since it is larger than the sum of its proper divisors (235187854).

311221442 is a wasteful number, since it uses less digits than its factorization.

311221442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19662 (or 19655 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 311221442 is about 17641.4693832458. The cubic root of 311221442 is about 677.6776616812.

Adding to 311221442 its reverse (244122113), we get a palindrome (555343555).

The spelling of 311221442 in words is "three hundred eleven million, two hundred twenty-one thousand, four hundred forty-two".