217060381 has 2 divisors, whose sum is σ = 217060382. Its totient is φ = 217060380.

The previous prime is 217060379. The next prime is 217060423. The reversal of 217060381 is 183060712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125552025 + 91508356 = 11205^2 + 9566^2 .

It is a cyclic number.

It is not a de Polignac number, because 217060381 - 2¹ = 217060379 is a prime.

It is a super-2 number, since 2×217060381² = 94230417999730322, which contains 22 as substring.

Together with 217060379, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217060681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108530190 + 108530191.

It is an arithmetic number, because the mean of its divisors is an integer number (108530191).

Almost surely, 2^217060381 is an apocalyptic number.

It is an amenable number.

217060381 is a deficient number, since it is larger than the sum of its proper divisors (1).

217060381 is an equidigital number, since it uses as much as digits as its factorization.

217060381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 217060381 is about 14732.9691847910. The cubic root of 217060381 is about 600.9802319627.

The spelling of 217060381 in words is "two hundred seventeen million, sixty thousand, three hundred eighty-one".