217141997 has 2 divisors, whose sum is σ = 217141998. Its totient is φ = 217141996.

The previous prime is 217141943. The next prime is 217142033. The reversal of 217141997 is 799141712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204318436 + 12823561 = 14294^2 + 3581^2 .

It is a cyclic number.

It is not a de Polignac number, because 217141997 - 2⁸ = 217141741 is a prime.

It is a super-2 number, since 2×217141997² = 94301293722296018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217141297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108570998 + 108570999.

It is an arithmetic number, because the mean of its divisors is an integer number (108570999).

Almost surely, 2^217141997 is an apocalyptic number.

It is an amenable number.

217141997 is a deficient number, since it is larger than the sum of its proper divisors (1).

217141997 is an equidigital number, since it uses as much as digits as its factorization.

217141997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 41.

The square root of 217141997 is about 14735.7387666856. The cubic root of 217141997 is about 601.0555465764.

The spelling of 217141997 in words is "two hundred seventeen million, one hundred forty-one thousand, nine hundred ninety-seven".