311223018 has 16 divisors (see below), whose sum is σ = 627955776. Its totient is φ = 102822720.

The previous prime is 311223007. The next prime is 311223061. The reversal of 311223018 is 810322113.

311223018 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 311222985 and 311223003.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228838 + ... + 230193.

It is an arithmetic number, because the mean of its divisors is an integer number (39247236).

Almost surely, 2^311223018 is an apocalyptic number.

311223018 is an abundant number, since it is smaller than the sum of its proper divisors (316732758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311223018 is a wasteful number, since it uses less digits than its factorization.

311223018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459149.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 311223018 is about 17641.5140506704. The cubic root of 311223018 is about 677.6788055808.

The spelling of 311223018 in words is "three hundred eleven million, two hundred twenty-three thousand, eighteen".