231340013 has 4 divisors (see below), whose sum is σ = 232359360. Its totient is φ = 230320668.

The previous prime is 231340009. The next prime is 231340027. The reversal of 231340013 is 310043132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231340013 - 2² = 231340009 is a prime.

It is a super-2 number, since 2×231340013² = 107036403229680338, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231339973 and 231340000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231340033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509333 + ... + 509786.

It is an arithmetic number, because the mean of its divisors is an integer number (58089840).

Almost surely, 2^231340013 is an apocalyptic number.

It is an amenable number.

231340013 is a deficient number, since it is larger than the sum of its proper divisors (1019347).

231340013 is a wasteful number, since it uses less digits than its factorization.

231340013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019346.

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

The square root of 231340013 is about 15209.8656470069. The cubic root of 231340013 is about 613.8801424417.

Adding to 231340013 its reverse (310043132), we get a palindrome (541383145).

The spelling of 231340013 in words is "two hundred thirty-one million, three hundred forty thousand, thirteen".