217134899 has 2 divisors, whose sum is σ = 217134900. Its totient is φ = 217134898.

The previous prime is 217134871. The next prime is 217134901. The reversal of 217134899 is 998431712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217134899 is a prime.

Together with 217134901, 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 (217134839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108567449 + 108567450.

It is an arithmetic number, because the mean of its divisors is an integer number (108567450).

Almost surely, 2^217134899 is an apocalyptic number.

217134899 is a deficient number, since it is larger than the sum of its proper divisors (1).

217134899 is an equidigital number, since it uses as much as digits as its factorization.

217134899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 217134899 is about 14735.4979216856. The cubic root of 217134899 is about 601.0489973462.

The spelling of 217134899 in words is "two hundred seventeen million, one hundred thirty-four thousand, eight hundred ninety-nine".