231564211 has 2 divisors, whose sum is σ = 231564212. Its totient is φ = 231564210.

The previous prime is 231564199. The next prime is 231564227. The reversal of 231564211 is 112465132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231564211 - 2⁷ = 231564083 is a prime.

It is not a weakly prime, because it can be changed into another prime (231564251) 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, 115782105 + 115782106.

It is an arithmetic number, because the mean of its divisors is an integer number (115782106).

Almost surely, 2^231564211 is an apocalyptic number.

231564211 is a deficient number, since it is larger than the sum of its proper divisors (1).

231564211 is an equidigital number, since it uses as much as digits as its factorization.

231564211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 231564211 is about 15217.2340127896. The cubic root of 231564211 is about 614.0783878176.

The spelling of 231564211 in words is "two hundred thirty-one million, five hundred sixty-four thousand, two hundred eleven".