231391103 has 2 divisors, whose sum is σ = 231391104. Its totient is φ = 231391102.

The previous prime is 231391073. The next prime is 231391129. The reversal of 231391103 is 301193132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231391103 - 2⁸ = 231390847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231391603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115695551 + 115695552.

It is an arithmetic number, because the mean of its divisors is an integer number (115695552).

Almost surely, 2^231391103 is an apocalyptic number.

231391103 is a deficient number, since it is larger than the sum of its proper divisors (1).

231391103 is an equidigital number, since it uses as much as digits as its factorization.

231391103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 231391103 is about 15211.5450563051. The cubic root of 231391103 is about 613.9253296499.

It can be divided in two parts, 23139 and 1103, that added together give a palindrome (24242).

The spelling of 231391103 in words is "two hundred thirty-one million, three hundred ninety-one thousand, one hundred three".