538147217 has 2 divisors, whose sum is σ = 538147218. Its totient is φ = 538147216.

The previous prime is 538147187. The next prime is 538147219. The reversal of 538147217 is 712741835.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 292786321 + 245360896 = 17111^2 + 15664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-538147217 is a prime.

Together with 538147219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (538147219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269073608 + 269073609.

It is an arithmetic number, because the mean of its divisors is an integer number (269073609).

Almost surely, 2^538147217 is an apocalyptic number.

It is an amenable number.

538147217 is a deficient number, since it is larger than the sum of its proper divisors (1).

538147217 is an equidigital number, since it uses as much as digits as its factorization.

538147217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 38.

The square root of 538147217 is about 23198.0002801966. Note that the first 3 decimals coincide. The cubic root of 538147217 is about 813.3928794791.

The spelling of 538147217 in words is "five hundred thirty-eight million, one hundred forty-seven thousand, two hundred seventeen".