217148057 has 12 divisors (see below), whose sum is σ = 253175076. Its totient is φ = 185703840.

The previous prime is 217148051. The next prime is 217148059. The reversal of 217148057 is 750841712.

It can be written as a sum of positive squares in 2 ways, for example, as 164454976 + 52693081 = 12824^2 + 7259^2 .

It is not a de Polignac number, because 217148057 - 2⁶ = 217147993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217148051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17783 + ... + 27395.

It is an arithmetic number, because the mean of its divisors is an integer number (21097923).

Almost surely, 2^217148057 is an apocalyptic number.

It is an amenable number.

217148057 is a deficient number, since it is larger than the sum of its proper divisors (36027019).

217148057 is an equidigital number, since it uses as much as digits as its factorization.

217148057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10088 (or 10081 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 217148057 is about 14735.9443877887. The cubic root of 217148057 is about 601.0611379448.

Adding to 217148057 its reverse (750841712), we get a palindrome (967989769).

The spelling of 217148057 in words is "two hundred seventeen million, one hundred forty-eight thousand, fifty-seven".