311213123 has 24 divisors (see below), whose sum is σ = 358671600. Its totient is φ = 268107840.

The previous prime is 311213117. The next prime is 311213131. The reversal of 311213123 is 321312113.

It is not a de Polignac number, because 311213123 - 2⁴ = 311213107 is a prime.

It is a Duffinian number.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 361868 + ... + 362726.

It is an arithmetic number, because the mean of its divisors is an integer number (14944650).

Almost surely, 2^311213123 is an apocalyptic number.

311213123 is a deficient number, since it is larger than the sum of its proper divisors (47458477).

311213123 is a wasteful number, since it uses less digits than its factorization.

311213123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963 (or 932 counting only the distinct ones).

The product of its digits is 108, while the sum is 17.

The square root of 311213123 is about 17641.2336019905. The cubic root of 311213123 is about 677.6716234826.

Adding to 311213123 its reverse (321312113), we get a palindrome (632525236).

The spelling of 311213123 in words is "three hundred eleven million, two hundred thirteen thousand, one hundred twenty-three".