217415057 has 4 divisors (see below), whose sum is σ = 230204196. Its totient is φ = 204625920.

The previous prime is 217415053. The next prime is 217415069. The reversal of 217415057 is 750514712.

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 194909521 + 22505536 = 13961^2 + 4744^2 .

It is a cyclic number.

It is not a de Polignac number, because 217415057 - 2² = 217415053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217415053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6394544 + ... + 6394577.

It is an arithmetic number, because the mean of its divisors is an integer number (57551049).

Almost surely, 2^217415057 is an apocalyptic number.

It is an amenable number.

217415057 is a deficient number, since it is larger than the sum of its proper divisors (12789139).

217415057 is a wasteful number, since it uses less digits than its factorization.

217415057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12789138.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 217415057 is about 14745.0010851136. The cubic root of 217415057 is about 601.3073871253.

Subtracting from 217415057 its sum of digits (32), we obtain a square (217415025 = 14745²).

Adding to 217415057 its reverse (750514712), we get a palindrome (967929769).

The spelling of 217415057 in words is "two hundred seventeen million, four hundred fifteen thousand, fifty-seven".