231133122013 has 4 divisors (see below), whose sum is σ = 231150240028. Its totient is φ = 231116004000.

The previous prime is 231133121993. The next prime is 231133122049. The reversal of 231133122013 is 310221331132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115884414724 + 115248707289 = 340418^2 + 339483^2 .

It is a cyclic number.

It is not a de Polignac number, because 231133122013 - 2¹³ = 231133113821 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 (231133122613) 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, 8538738 + ... + 8565763.

It is an arithmetic number, because the mean of its divisors is an integer number (57787560007).

Almost surely, 2^231133122013 is an apocalyptic number.

It is an amenable number.

231133122013 is a deficient number, since it is larger than the sum of its proper divisors (17118015).

231133122013 is a wasteful number, since it uses less digits than its factorization.

231133122013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17118014.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 231133122013 its reverse (310221331132), we get a palindrome (541354453145).

The spelling of 231133122013 in words is "two hundred thirty-one billion, one hundred thirty-three million, one hundred twenty-two thousand, thirteen".