213131233 has 6 divisors (see below), whose sum is σ = 247928226. Its totient is φ = 182683872.

The previous prime is 213131209. The next prime is 213131249. The reversal of 213131233 is 332131312.

It can be written as a sum of positive squares in only one way, i.e., 212809744 + 321489 = 14588^2 + 567^2 .

It is not a de Polignac number, because 213131233 - 2⁹ = 213130721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213131233.

It is not an unprimeable number, because it can be changed into a prime (213131203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2174760 + ... + 2174857.

It is an arithmetic number, because the mean of its divisors is an integer number (41321371).

Almost surely, 2^213131233 is an apocalyptic number.

It is an amenable number.

213131233 is a deficient number, since it is larger than the sum of its proper divisors (34796993).

213131233 is an equidigital number, since it uses as much as digits as its factorization.

213131233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4349631 (or 4349624 counting only the distinct ones).

The product of its digits is 324, while the sum is 19.

The square root of 213131233 is about 14599.0147955264. The cubic root of 213131233 is about 597.3318871357.

Adding to 213131233 its reverse (332131312), we get a palindrome (545262545).

The spelling of 213131233 in words is "two hundred thirteen million, one hundred thirty-one thousand, two hundred thirty-three".