231036217 has 2 divisors, whose sum is σ = 231036218. Its totient is φ = 231036216.

The previous prime is 231036193. The next prime is 231036229. The reversal of 231036217 is 712630132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125686521 + 105349696 = 11211^2 + 10264^2 .

It is a cyclic number.

It is not a de Polignac number, because 231036217 - 2⁷ = 231036089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231036191 and 231036200.

It is not a weakly prime, because it can be changed into another prime (231036017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115518108 + 115518109.

It is an arithmetic number, because the mean of its divisors is an integer number (115518109).

Almost surely, 2^231036217 is an apocalyptic number.

It is an amenable number.

231036217 is a deficient number, since it is larger than the sum of its proper divisors (1).

231036217 is an equidigital number, since it uses as much as digits as its factorization.

231036217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 231036217 is about 15199.8755587011. The cubic root of 231036217 is about 613.6113086678.

Adding to 231036217 its reverse (712630132), we get a palindrome (943666349).

The spelling of 231036217 in words is "two hundred thirty-one million, thirty-six thousand, two hundred seventeen".