311121242 has 4 divisors (see below), whose sum is σ = 466681866. Its totient is φ = 155560620.

The previous prime is 311121227. The next prime is 311121259. The reversal of 311121242 is 242121113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 282273601 + 28847641 = 16801^2 + 5371^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 311121242.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77780309 + ... + 77780312.

Almost surely, 2^311121242 is an apocalyptic number.

311121242 is a deficient number, since it is larger than the sum of its proper divisors (155560624).

311121242 is a wasteful number, since it uses less digits than its factorization.

311121242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155560623.

The product of its digits is 96, while the sum is 17.

The square root of 311121242 is about 17638.6292551320. The cubic root of 311121242 is about 677.6049261290.

Adding to 311121242 its reverse (242121113), we get a palindrome (553242355).

The spelling of 311121242 in words is "three hundred eleven million, one hundred twenty-one thousand, two hundred forty-two".