217403053 has 12 divisors (see below), whose sum is σ = 261619740. Its totient is φ = 179918592.

The previous prime is 217403047. The next prime is 217403057. The reversal of 217403053 is 350304712.

It can be written as a sum of positive squares in 2 ways, for example, as 87853129 + 129549924 = 9373^2 + 11382^2 .

It is a de Polignac number, because none of the positive numbers 2^k-217403053 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 (217403057) 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 11 ways as a sum of consecutive naturals, for example, 75076 + ... + 77917.

It is an arithmetic number, because the mean of its divisors is an integer number (21801645).

Almost surely, 2^217403053 is an apocalyptic number.

It is an amenable number.

217403053 is a deficient number, since it is larger than the sum of its proper divisors (44216687).

217403053 is a wasteful number, since it uses less digits than its factorization.

217403053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153036 (or 153029 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 217403053 is about 14744.5940262864. The cubic root of 217403053 is about 601.2963203869.

Adding to 217403053 its reverse (350304712), we get a palindrome (567707765).

The spelling of 217403053 in words is "two hundred seventeen million, four hundred three thousand, fifty-three".