231145213 has 8 divisors (see below), whose sum is σ = 250576256. Its totient is φ = 211950000.

The previous prime is 231145199. The next prime is 231145219. The reversal of 231145213 is 312541132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231145213 - 2⁵ = 231145181 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 (231145219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56913 + ... + 60838.

It is an arithmetic number, because the mean of its divisors is an integer number (31322032).

Almost surely, 2^231145213 is an apocalyptic number.

It is an amenable number.

231145213 is a deficient number, since it is larger than the sum of its proper divisors (19431043).

231145213 is a wasteful number, since it uses less digits than its factorization.

231145213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117915.

The product of its digits is 720, while the sum is 22.

The square root of 231145213 is about 15203.4605600172. The cubic root of 231145213 is about 613.7077880053.

Adding to 231145213 its reverse (312541132), we get a palindrome (543686345).

It can be divided in two parts, 2311 and 45213, that added together give a square (47524 = 218²).

The spelling of 231145213 in words is "two hundred thirty-one million, one hundred forty-five thousand, two hundred thirteen".