231440207 has 2 divisors, whose sum is σ = 231440208. Its totient is φ = 231440206.

The previous prime is 231440201. The next prime is 231440219. The reversal of 231440207 is 702044132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231440207 - 2¹⁰ = 231439183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231440201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115720103 + 115720104.

It is an arithmetic number, because the mean of its divisors is an integer number (115720104).

Almost surely, 2^231440207 is an apocalyptic number.

231440207 is a deficient number, since it is larger than the sum of its proper divisors (1).

231440207 is an equidigital number, since it uses as much as digits as its factorization.

231440207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 231440207 is about 15213.1590079115. The cubic root of 231440207 is about 613.9687540466.

Adding to 231440207 its reverse (702044132), we get a palindrome (933484339).

The spelling of 231440207 in words is "two hundred thirty-one million, four hundred forty thousand, two hundred seven".