217432493 has 4 divisors (see below), whose sum is σ = 217468188. Its totient is φ = 217396800.

The previous prime is 217432483. The next prime is 217432511. The reversal of 217432493 is 394234712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 205578244 + 11854249 = 14338^2 + 3443^2 .

It is a cyclic number.

It is not a de Polignac number, because 217432493 - 2⁴ = 217432477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217432433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6158 + ... + 21743.

It is an arithmetic number, because the mean of its divisors is an integer number (54367047).

Almost surely, 2^217432493 is an apocalyptic number.

It is an amenable number.

217432493 is a deficient number, since it is larger than the sum of its proper divisors (35695).

217432493 is an equidigital number, since it uses as much as digits as its factorization.

217432493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35694.

The product of its digits is 36288, while the sum is 35.

The square root of 217432493 is about 14745.5923244880. The cubic root of 217432493 is about 601.3234610126.

The spelling of 217432493 in words is "two hundred seventeen million, four hundred thirty-two thousand, four hundred ninety-three".