231009817 has 2 divisors, whose sum is σ = 231009818. Its totient is φ = 231009816.

The previous prime is 231009797. The next prime is 231009859. The reversal of 231009817 is 718900132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142348761 + 88661056 = 11931^2 + 9416^2 .

It is a cyclic number.

It is not a de Polignac number, because 231009817 - 2⁷ = 231009689 is a prime.

It is not a weakly prime, because it can be changed into another prime (231009517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115504908 + 115504909.

It is an arithmetic number, because the mean of its divisors is an integer number (115504909).

Almost surely, 2^231009817 is an apocalyptic number.

It is an amenable number.

231009817 is a deficient number, since it is larger than the sum of its proper divisors (1).

231009817 is an equidigital number, since it uses as much as digits as its factorization.

231009817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 231009817 is about 15199.0071057290. The cubic root of 231009817 is about 613.5879357730.

Adding to 231009817 its reverse (718900132), we get a palindrome (949909949).

The spelling of 231009817 in words is "two hundred thirty-one million, nine thousand, eight hundred seventeen".