243145021131 has 8 divisors (see below), whose sum is σ = 360214846160. Its totient is φ = 162096680736.

The previous prime is 243145021099. The next prime is 243145021139. The reversal of 243145021131 is 131120541342.

243145021131 is a `hidden beast` number, since 2 + 43 + 1 + 4 + 502 + 113 + 1 = 666.

243145021131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243145021131 - 2⁵ = 243145021099 is a prime.

It is a super-2 number, since 2×243145021131² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 9005371153 = 243145021131 / (2 + 4 + 3 + 1 + 4 + 5 + 0 + 2 + 1 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243145021095 and 243145021104.

It is not an unprimeable number, because it can be changed into a prime (243145021139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4502685550 + ... + 4502685603.

It is an arithmetic number, because the mean of its divisors is an integer number (45026855770).

Almost surely, 2^243145021131 is an apocalyptic number.

243145021131 is a deficient number, since it is larger than the sum of its proper divisors (117069825029).

243145021131 is an equidigital number, since it uses as much as digits as its factorization.

243145021131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9005371162 (or 9005371156 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 243145021131 its reverse (131120541342), we get a palindrome (374265562473).

The spelling of 243145021131 in words is "two hundred forty-three billion, one hundred forty-five million, twenty-one thousand, one hundred thirty-one".