231331221133 has 2 divisors, whose sum is σ = 231331221134. Its totient is φ = 231331221132.

The previous prime is 231331221127. The next prime is 231331221157. The reversal of 231331221133 is 331122133132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218661917769 + 12669303364 = 467613^2 + 112558^2 .

It is a cyclic number.

It is not a de Polignac number, because 231331221133 - 2¹³ = 231331212941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231331221098 and 231331221107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231331221193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115665610566 + 115665610567.

It is an arithmetic number, because the mean of its divisors is an integer number (115665610567).

Almost surely, 2^231331221133 is an apocalyptic number.

It is an amenable number.

231331221133 is a deficient number, since it is larger than the sum of its proper divisors (1).

231331221133 is an equidigital number, since it uses as much as digits as its factorization.

231331221133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 25.

Adding to 231331221133 its reverse (331122133132), we get a palindrome (562453354265).

The spelling of 231331221133 in words is "two hundred thirty-one billion, three hundred thirty-one million, two hundred twenty-one thousand, one hundred thirty-three".