210542317 has 2 divisors, whose sum is σ = 210542318. Its totient is φ = 210542316.

The previous prime is 210542239. The next prime is 210542323. The reversal of 210542317 is 713245012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203604361 + 6937956 = 14269^2 + 2634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210542317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210542291 and 210542300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210542417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105271158 + 105271159.

It is an arithmetic number, because the mean of its divisors is an integer number (105271159).

Almost surely, 2^210542317 is an apocalyptic number.

It is an amenable number.

210542317 is a deficient number, since it is larger than the sum of its proper divisors (1).

210542317 is an equidigital number, since it uses as much as digits as its factorization.

210542317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 210542317 is about 14510.0763953881. The cubic root of 210542317 is about 594.9034205222.

Adding to 210542317 its reverse (713245012), we get a palindrome (923787329).

The spelling of 210542317 in words is "two hundred ten million, five hundred forty-two thousand, three hundred seventeen".