231985141 has 2 divisors, whose sum is σ = 231985142. Its totient is φ = 231985140.

The previous prime is 231985139. The next prime is 231985157. The reversal of 231985141 is 141589132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194714116 + 37271025 = 13954^2 + 6105^2 .

It is a cyclic number.

It is not a de Polignac number, because 231985141 - 2¹ = 231985139 is a prime.

Together with 231985139, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 231985097 and 231985106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231985841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115992570 + 115992571.

It is an arithmetic number, because the mean of its divisors is an integer number (115992571).

Almost surely, 2^231985141 is an apocalyptic number.

It is an amenable number.

231985141 is a deficient number, since it is larger than the sum of its proper divisors (1).

231985141 is an equidigital number, since it uses as much as digits as its factorization.

231985141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 231985141 is about 15231.0584333460. The cubic root of 231985141 is about 614.4502465940.

The spelling of 231985141 in words is "two hundred thirty-one million, nine hundred eighty-five thousand, one hundred forty-one".