231111133133 has 6 divisors (see below), whose sum is σ = 238806822222. Its totient is φ = 223655934360.

The previous prime is 231111133111. The next prime is 231111133147. The reversal of 231111133133 is 331331111132.

It can be written as a sum of positive squares in only one way, i.e., 141118932964 + 89992200169 = 375658^2 + 299987^2 .

It is not a de Polignac number, because 231111133133 - 2⁶ = 231111133069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231111133099 and 231111133108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231111133103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120244166 + ... + 120246087.

It is an arithmetic number, because the mean of its divisors is an integer number (39801137037).

Almost surely, 2^231111133133 is an apocalyptic number.

It is an amenable number.

231111133133 is a deficient number, since it is larger than the sum of its proper divisors (7695689089).

231111133133 is an equidigital number, since it uses as much as digits as its factorization.

231111133133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240490315 (or 240490284 counting only the distinct ones).

The product of its digits is 486, while the sum is 23.

Adding to 231111133133 its reverse (331331111132), we get a palindrome (562442244265).

The spelling of 231111133133 in words is "two hundred thirty-one billion, one hundred eleven million, one hundred thirty-three thousand, one hundred thirty-three".