217315147 has 12 divisors (see below), whose sum is σ = 253750320. Its totient is φ = 185566416.

The previous prime is 217315079. The next prime is 217315151. The reversal of 217315147 is 741513712.

It is a de Polignac number, because none of the positive numbers 2^k-217315147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217315157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4938 + ... + 21424.

It is an arithmetic number, because the mean of its divisors is an integer number (21145860).

Almost surely, 2^217315147 is an apocalyptic number.

217315147 is a deficient number, since it is larger than the sum of its proper divisors (36435173).

217315147 is a wasteful number, since it uses less digits than its factorization.

217315147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16770 (or 16763 counting only the distinct ones).

The product of its digits is 5880, while the sum is 31.

The square root of 217315147 is about 14741.6127679437. The cubic root of 217315147 is about 601.2152655911.

Adding to 217315147 its reverse (741513712), we get a palindrome (958828859).

The spelling of 217315147 in words is "two hundred seventeen million, three hundred fifteen thousand, one hundred forty-seven".