311220242 has 4 divisors (see below), whose sum is σ = 466830366. Its totient is φ = 155610120.

The previous prime is 311220233. The next prime is 311220251. The reversal of 311220242 is 242022113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242022113 = 709 ⋅341357.

It is an interprime number because it is at equal distance from previous prime (311220233) and next prime (311220251).

It can be written as a sum of positive squares in only one way, i.e., 309091561 + 2128681 = 17581^2 + 1459^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 311220242.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77805059 + ... + 77805062.

Almost surely, 2^311220242 is an apocalyptic number.

311220242 is a deficient number, since it is larger than the sum of its proper divisors (155610124).

311220242 is a wasteful number, since it uses less digits than its factorization.

311220242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155610123.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 311220242 is about 17641.4353724406. The cubic root of 311220242 is about 677.6767906892.

Adding to 311220242 its reverse (242022113), we get a palindrome (553242355).

The spelling of 311220242 in words is "three hundred eleven million, two hundred twenty thousand, two hundred forty-two".