311242123 has 4 divisors (see below), whose sum is σ = 321974640. Its totient is φ = 300509608.

The previous prime is 311242117. The next prime is 311242147. The reversal of 311242123 is 321242113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321242113 = 2531 ⋅126923.

It is a cyclic number.

It is not a de Polignac number, because 311242123 - 2¹³ = 311233931 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 311242123.

It is not an unprimeable number, because it can be changed into a prime (311242223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5366215 + ... + 5366272.

It is an arithmetic number, because the mean of its divisors is an integer number (80493660).

Almost surely, 2^311242123 is an apocalyptic number.

311242123 is a deficient number, since it is larger than the sum of its proper divisors (10732517).

311242123 is a wasteful number, since it uses less digits than its factorization.

311242123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10732516.

The product of its digits is 288, while the sum is 19.

The square root of 311242123 is about 17642.0555208286. The cubic root of 311242123 is about 677.6926721522.

Adding to 311242123 its reverse (321242113), we get a palindrome (632484236).

The spelling of 311242123 in words is "three hundred eleven million, two hundred forty-two thousand, one hundred twenty-three".