231141187 has 2 divisors, whose sum is σ = 231141188. Its totient is φ = 231141186.

The previous prime is 231141181. The next prime is 231141217. The reversal of 231141187 is 781141132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231141187 - 2²⁷ = 96923459 is a prime.

It is not a weakly prime, because it can be changed into another prime (231141181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115570593 + 115570594.

It is an arithmetic number, because the mean of its divisors is an integer number (115570594).

Almost surely, 2^231141187 is an apocalyptic number.

231141187 is a deficient number, since it is larger than the sum of its proper divisors (1).

231141187 is an equidigital number, since it uses as much as digits as its factorization.

231141187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 231141187 is about 15203.3281553744. The cubic root of 231141187 is about 613.7042248745.

Subtracting 231141187 from its reverse (781141132), we obtain a palindrome (549999945).

The spelling of 231141187 in words is "two hundred thirty-one million, one hundred forty-one thousand, one hundred eighty-seven".