231213489 has 16 divisors (see below), whose sum is σ = 349473600. Its totient is φ = 134796096.

The previous prime is 231213467. The next prime is 231213497. The reversal of 231213489 is 984312132.

It is not a de Polignac number, because 231213489 - 2⁷ = 231213361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231213439) 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, 155274 + ... + 156755.

It is an arithmetic number, because the mean of its divisors is an integer number (21842100).

Almost surely, 2^231213489 is an apocalyptic number.

It is an amenable number.

231213489 is a deficient number, since it is larger than the sum of its proper divisors (118260111).

231213489 is a wasteful number, since it uses less digits than its factorization.

231213489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312064.

The product of its digits is 10368, while the sum is 33.

The square root of 231213489 is about 15205.7058040724. The cubic root of 231213489 is about 613.7682080149.

The spelling of 231213489 in words is "two hundred thirty-one million, two hundred thirteen thousand, four hundred eighty-nine".