217040597 has 2 divisors, whose sum is σ = 217040598. Its totient is φ = 217040596.

The previous prime is 217040573. The next prime is 217040599. The reversal of 217040597 is 795040712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123454321 + 93586276 = 11111^2 + 9674^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217040597 is a prime.

It is a super-2 number, since 2×217040597² = 94213241492232818, which contains 22 as substring.

Together with 217040599, 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 (217040599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108520298 + 108520299.

It is an arithmetic number, because the mean of its divisors is an integer number (108520299).

Almost surely, 2^217040597 is an apocalyptic number.

It is an amenable number.

217040597 is a deficient number, since it is larger than the sum of its proper divisors (1).

217040597 is an equidigital number, since it uses as much as digits as its factorization.

217040597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 217040597 is about 14732.2977501814. The cubic root of 217040597 is about 600.9619725977.

The spelling of 217040597 in words is "two hundred seventeen million, forty thousand, five hundred ninety-seven".