217495253 has 2 divisors, whose sum is σ = 217495254. Its totient is φ = 217495252.

The previous prime is 217495241. The next prime is 217495277. The reversal of 217495253 is 352594712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201157489 + 16337764 = 14183^2 + 4042^2 .

It is a cyclic number.

It is not a de Polignac number, because 217495253 - 2⁴ = 217495237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217497253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108747626 + 108747627.

It is an arithmetic number, because the mean of its divisors is an integer number (108747627).

Almost surely, 2^217495253 is an apocalyptic number.

It is an amenable number.

217495253 is a deficient number, since it is larger than the sum of its proper divisors (1).

217495253 is an equidigital number, since it uses as much as digits as its factorization.

217495253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 217495253 is about 14747.7202645019. The cubic root of 217495253 is about 601.3813110445.

The spelling of 217495253 in words is "two hundred seventeen million, four hundred ninety-five thousand, two hundred fifty-three".