311213118 has 48 divisors (see below), whose sum is σ = 668115504. Its totient is φ = 96614400.

The previous prime is 311213117. The next prime is 311213131. The reversal of 311213118 is 811312113.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 311213094 and 311213103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311213113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174246 + ... + 176022.

It is an arithmetic number, because the mean of its divisors is an integer number (13919073).

Almost surely, 2^311213118 is an apocalyptic number.

311213118 is an abundant number, since it is smaller than the sum of its proper divisors (356902386).

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

311213118 is a wasteful number, since it uses less digits than its factorization.

311213118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917 (or 1900 counting only the distinct ones).

The product of its digits is 144, while the sum is 21.

The square root of 311213118 is about 17641.2334602771. The cubic root of 311213118 is about 677.6716198534.

The spelling of 311213118 in words is "three hundred eleven million, two hundred thirteen thousand, one hundred eighteen".