217472434987 has 2 divisors, whose sum is σ = 217472434988. Its totient is φ = 217472434986.

The previous prime is 217472434973. The next prime is 217472435057. The reversal of 217472434987 is 789434274712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217472434987 - 2³⁵ = 183112696619 is a prime.

It is not a weakly prime, because it can be changed into another prime (217472434937) 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, 108736217493 + 108736217494.

It is an arithmetic number, because the mean of its divisors is an integer number (108736217494).

Almost surely, 2^217472434987 is an apocalyptic number.

217472434987 is a deficient number, since it is larger than the sum of its proper divisors (1).

217472434987 is an equidigital number, since it uses as much as digits as its factorization.

217472434987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18966528, while the sum is 58.

The spelling of 217472434987 in words is "two hundred seventeen billion, four hundred seventy-two million, four hundred thirty-four thousand, nine hundred eighty-seven".