231022217 has 2 divisors, whose sum is σ = 231022218. Its totient is φ = 231022216.

The previous prime is 231022201. The next prime is 231022223. The reversal of 231022217 is 712220132.

231022217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116553616 + 114468601 = 10796^2 + 10699^2 .

It is a cyclic number.

It is not a de Polignac number, because 231022217 - 2⁴ = 231022201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231022277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115511108 + 115511109.

It is an arithmetic number, because the mean of its divisors is an integer number (115511109).

Almost surely, 2^231022217 is an apocalyptic number.

It is an amenable number.

231022217 is a deficient number, since it is larger than the sum of its proper divisors (1).

231022217 is an equidigital number, since it uses as much as digits as its factorization.

231022217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 231022217 is about 15199.4150216382. The cubic root of 231022217 is about 613.5989141726.

Adding to 231022217 its reverse (712220132), we get a palindrome (943242349).

The spelling of 231022217 in words is "two hundred thirty-one million, twenty-two thousand, two hundred seventeen".