217130887 has 2 divisors, whose sum is σ = 217130888. Its totient is φ = 217130886.

The previous prime is 217130869. The next prime is 217130899. The reversal of 217130887 is 788031712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217130887 - 2²³ = 208742279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217130807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108565443 + 108565444.

It is an arithmetic number, because the mean of its divisors is an integer number (108565444).

Almost surely, 2^217130887 is an apocalyptic number.

217130887 is a deficient number, since it is larger than the sum of its proper divisors (1).

217130887 is an equidigital number, since it uses as much as digits as its factorization.

217130887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 217130887 is about 14735.3617872111. The cubic root of 217130887 is about 601.0452954640.

The spelling of 217130887 in words is "two hundred seventeen million, one hundred thirty thousand, eight hundred eighty-seven".