231405667 has 2 divisors, whose sum is σ = 231405668. Its totient is φ = 231405666.

The previous prime is 231405637. The next prime is 231405677. The reversal of 231405667 is 766504132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231405667 - 2¹¹ = 231403619 is a prime.

It is not a weakly prime, because it can be changed into another prime (231405637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115702833 + 115702834.

It is an arithmetic number, because the mean of its divisors is an integer number (115702834).

Almost surely, 2^231405667 is an apocalyptic number.

231405667 is a deficient number, since it is larger than the sum of its proper divisors (1).

231405667 is an equidigital number, since it uses as much as digits as its factorization.

231405667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 231405667 is about 15212.0237641150. The cubic root of 231405667 is about 613.9382097488.

Adding to 231405667 its reverse (766504132), we get a palindrome (997909799).

The spelling of 231405667 in words is "two hundred thirty-one million, four hundred five thousand, six hundred sixty-seven".