231111229 has 2 divisors, whose sum is σ = 231111230. Its totient is φ = 231111228.

The previous prime is 231111203. The next prime is 231111233. The reversal of 231111229 is 922111132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153636025 + 77475204 = 12395^2 + 8802^2 .

It is a cyclic number.

It is not a de Polignac number, because 231111229 - 2²⁵ = 197556797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231111029) 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, 115555614 + 115555615.

It is an arithmetic number, because the mean of its divisors is an integer number (115555615).

Almost surely, 2^231111229 is an apocalyptic number.

It is an amenable number.

231111229 is a deficient number, since it is larger than the sum of its proper divisors (1).

231111229 is an equidigital number, since it uses as much as digits as its factorization.

231111229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 22.

The square root of 231111229 is about 15202.3428786487. The cubic root of 231111229 is about 613.6777098459.

The spelling of 231111229 in words is "two hundred thirty-one million, one hundred eleven thousand, two hundred twenty-nine".