231321111187 has 2 divisors, whose sum is σ = 231321111188. Its totient is φ = 231321111186.

The previous prime is 231321111173. The next prime is 231321111223. The reversal of 231321111187 is 781111123132.

231321111187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231321111187 is a prime.

It is not a weakly prime, because it can be changed into another prime (231321111157) 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 as a sum of consecutive naturals, namely, 115660555593 + 115660555594.

It is an arithmetic number, because the mean of its divisors is an integer number (115660555594).

Almost surely, 2^231321111187 is an apocalyptic number.

231321111187 is a deficient number, since it is larger than the sum of its proper divisors (1).

231321111187 is an equidigital number, since it uses as much as digits as its factorization.

231321111187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 31.

The spelling of 231321111187 in words is "two hundred thirty-one billion, three hundred twenty-one million, one hundred eleven thousand, one hundred eighty-seven".