231212013 has 8 divisors (see below), whose sum is σ = 311461248. Its totient is φ = 152552064.

The previous prime is 231211961. The next prime is 231212057. The reversal of 231212013 is 310212132.

231212013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 231212013 - 2¹² = 231207917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231211983 and 231212001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231212213) 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, 396981 + ... + 397562.

It is an arithmetic number, because the mean of its divisors is an integer number (38932656).

Almost surely, 2^231212013 is an apocalyptic number.

It is an amenable number.

231212013 is a deficient number, since it is larger than the sum of its proper divisors (80249235).

231212013 is an equidigital number, since it uses as much as digits as its factorization.

231212013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794643.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 231212013 is about 15205.6572695823. The cubic root of 231212013 is about 613.7669019726.

Adding to 231212013 its reverse (310212132), we get a palindrome (541424145).

The spelling of 231212013 in words is "two hundred thirty-one million, two hundred twelve thousand, thirteen".