231043013 has 4 divisors (see below), whose sum is σ = 231074508. Its totient is φ = 231011520.

The previous prime is 231043003. The next prime is 231043037. The reversal of 231043013 is 310340132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 60949249 + 170093764 = 7807^2 + 13042^2 .

It is a cyclic number.

It is not a de Polignac number, because 231043013 - 2⁶ = 231042949 is a prime.

It is a super-2 number, since 2×231043013² = 106761747712236338, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231042982 and 231043000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231043003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1703 + ... + 21563.

It is an arithmetic number, because the mean of its divisors is an integer number (57768627).

Almost surely, 2^231043013 is an apocalyptic number.

It is an amenable number.

231043013 is a deficient number, since it is larger than the sum of its proper divisors (31495).

231043013 is a wasteful number, since it uses less digits than its factorization.

231043013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31494.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231043013 is about 15200.0991115190. The cubic root of 231043013 is about 613.6173251294.

Adding to 231043013 its reverse (310340132), we get a palindrome (541383145).

The spelling of 231043013 in words is "two hundred thirty-one million, forty-three thousand, thirteen".