231145111 has 2 divisors, whose sum is σ = 231145112. Its totient is φ = 231145110.

The previous prime is 231145097. The next prime is 231145151. The reversal of 231145111 is 111541132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231145111 - 2⁷ = 231144983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231145151) 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, 115572555 + 115572556.

It is an arithmetic number, because the mean of its divisors is an integer number (115572556).

Almost surely, 2^231145111 is an apocalyptic number.

231145111 is a deficient number, since it is larger than the sum of its proper divisors (1).

231145111 is an equidigital number, since it uses as much as digits as its factorization.

231145111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 19.

The square root of 231145111 is about 15203.4572055174. The cubic root of 231145111 is about 613.7076977327.

Adding to 231145111 its reverse (111541132), we get a palindrome (342686243).

The spelling of 231145111 in words is "two hundred thirty-one million, one hundred forty-five thousand, one hundred eleven".