217999053 has 16 divisors (see below), whose sum is σ = 325024960. Its totient is φ = 144404208.

The previous prime is 217999051. The next prime is 217999073. The reversal of 217999053 is 350999712.

It is a happy number.

It is not a de Polignac number, because 217999053 - 2¹ = 217999051 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217999051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21475 + ... + 29952.

It is an arithmetic number, because the mean of its divisors is an integer number (20314060).

Almost surely, 2^217999053 is an apocalyptic number.

It is an amenable number.

217999053 is a deficient number, since it is larger than the sum of its proper divisors (107025907).

217999053 is a wasteful number, since it uses less digits than its factorization.

217999053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51593 (or 51587 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 45.

The square root of 217999053 is about 14764.7909907320. The cubic root of 217999053 is about 601.8452939988.

The spelling of 217999053 in words is "two hundred seventeen million, nine hundred ninety-nine thousand, fifty-three".