311242 has 4 divisors (see below), whose sum is σ = 466866. Its totient is φ = 155620.

The previous prime is 311237. The next prime is 311279. The reversal of 311242 is 242113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242113 = 197 ⋅1229.

It can be written as a sum of positive squares in only one way, i.e., 221841 + 89401 = 471^2 + 299^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77809 + ... + 77812.

2³¹¹²⁴² is an apocalyptic number.

311242 is a deficient number, since it is larger than the sum of its proper divisors (155624).

311242 is a wasteful number, since it uses less digits than its factorization.

311242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155623.

The product of its digits is 48, while the sum is 13.

The square root of 311242 is about 557.8906702930. The cubic root of 311242 is about 67.7692582880.

Adding to 311242 its reverse (242113), we get a palindrome (553355).

The spelling of 311242 in words is "three hundred eleven thousand, two hundred forty-two", and thus it is an iban number.