231032311 has 2 divisors, whose sum is σ = 231032312. Its totient is φ = 231032310.

The previous prime is 231032303. The next prime is 231032323. The reversal of 231032311 is 113230132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231032311 - 2³ = 231032303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231032411) 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, 115516155 + 115516156.

It is an arithmetic number, because the mean of its divisors is an integer number (115516156).

Almost surely, 2^231032311 is an apocalyptic number.

231032311 is a deficient number, since it is larger than the sum of its proper divisors (1).

231032311 is an equidigital number, since it uses as much as digits as its factorization.

231032311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 231032311 is about 15199.7470702640. The cubic root of 231032311 is about 613.6078506540.

Adding to 231032311 its reverse (113230132), we get a palindrome (344262443).

The spelling of 231032311 in words is "two hundred thirty-one million, thirty-two thousand, three hundred eleven".