231240323 has 2 divisors, whose sum is σ = 231240324. Its totient is φ = 231240322.

The previous prime is 231240313. The next prime is 231240371. The reversal of 231240323 is 323042132.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231240323 is a prime.

It is a super-2 number, since 2×231240323² = 106944173962288658, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 231240295 and 231240304.

It is not a weakly prime, because it can be changed into another prime (231240313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115620161 + 115620162.

It is an arithmetic number, because the mean of its divisors is an integer number (115620162).

Almost surely, 2^231240323 is an apocalyptic number.

231240323 is a deficient number, since it is larger than the sum of its proper divisors (1).

231240323 is an equidigital number, since it uses as much as digits as its factorization.

231240323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 231240323 is about 15206.5881446168. The cubic root of 231240323 is about 613.7919511784.

Adding to 231240323 its reverse (323042132), we get a palindrome (554282455).

The spelling of 231240323 in words is "two hundred thirty-one million, two hundred forty thousand, three hundred twenty-three".