231132213 has 24 divisors (see below), whose sum is σ = 360054968. Its totient is φ = 142031232.

The previous prime is 231132203. The next prime is 231132217. The reversal of 231132213 is 312231132.

It can be written as a sum of positive squares in 4 ways, for example, as 6671889 + 224460324 = 2583^2 + 14982^2 .

It is not a de Polignac number, because 231132213 - 2⁴ = 231132197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231132217) 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, 143931 + ... + 145527.

Almost surely, 2^231132213 is an apocalyptic number.

It is an amenable number.

231132213 is a deficient number, since it is larger than the sum of its proper divisors (128922755).

231132213 is a wasteful number, since it uses less digits than its factorization.

231132213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853 (or 2850 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 231132213 is about 15203.0330197629. The cubic root of 231132213 is about 613.6962824663.

Adding to 231132213 its reverse (312231132), we get a palindrome (543363345).

The spelling of 231132213 in words is "two hundred thirty-one million, one hundred thirty-two thousand, two hundred thirteen".