311312143 has 16 divisors (see below), whose sum is σ = 337029120. Its totient is φ = 286473600.

The previous prime is 311312101. The next prime is 311312171. The reversal of 311312143 is 341213113.

It is a cyclic number.

It is not a de Polignac number, because 311312143 - 2⁹ = 311311631 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 311312143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311312173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210898 + ... + 212368.

It is an arithmetic number, because the mean of its divisors is an integer number (21064320).

Almost surely, 2^311312143 is an apocalyptic number.

311312143 is a deficient number, since it is larger than the sum of its proper divisors (25716977).

311312143 is a wasteful number, since it uses less digits than its factorization.

311312143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758.

The product of its digits is 216, while the sum is 19.

The square root of 311312143 is about 17644.0398718661. The cubic root of 311312143 is about 677.7434884133.

Adding to 311312143 its reverse (341213113), we get a palindrome (652525256).

It can be divided in two parts, 3 and 11312143, that added together give a triangular number (11312146 = T₄₇₅₆).

The spelling of 311312143 in words is "three hundred eleven million, three hundred twelve thousand, one hundred forty-three".