217413971 has 2 divisors, whose sum is σ = 217413972. Its totient is φ = 217413970.

The previous prime is 217413919. The next prime is 217413991. The reversal of 217413971 is 179314712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217413971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (217413991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108706985 + 108706986.

It is an arithmetic number, because the mean of its divisors is an integer number (108706986).

Almost surely, 2^217413971 is an apocalyptic number.

217413971 is a deficient number, since it is larger than the sum of its proper divisors (1).

217413971 is an equidigital number, since it uses as much as digits as its factorization.

217413971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 35.

The square root of 217413971 is about 14744.9642590276. The cubic root of 217413971 is about 601.3063859360.

The spelling of 217413971 in words is "two hundred seventeen million, four hundred thirteen thousand, nine hundred seventy-one".