213131311 has 16 divisors (see below), whose sum is σ = 220824288. Its totient is φ = 205632000.

The previous prime is 213131309. The next prime is 213131327. The reversal of 213131311 is 113131312.

It is a cyclic number.

It is not a de Polignac number, because 213131311 - 2¹ = 213131309 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 (213131371) 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, 1009996 + ... + 1010206.

It is an arithmetic number, because the mean of its divisors is an integer number (13801518).

Almost surely, 2^213131311 is an apocalyptic number.

213131311 is a deficient number, since it is larger than the sum of its proper divisors (7692977).

213131311 is a wasteful number, since it uses less digits than its factorization.

213131311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522.

The product of its digits is 54, while the sum is 16.

The square root of 213131311 is about 14599.0174669393. The cubic root of 213131311 is about 597.3319600046.

Adding to 213131311 its reverse (113131312), we get a palindrome (326262623).

Subtracting from 213131311 its reverse (113131312), we obtain a palindrome (99999999).

The spelling of 213131311 in words is "two hundred thirteen million, one hundred thirty-one thousand, three hundred eleven".