217631053 has 2 divisors, whose sum is σ = 217631054. Its totient is φ = 217631052.

The previous prime is 217631023. The next prime is 217631081. The reversal of 217631053 is 350136712.

It is an a-pointer prime, because the next prime (217631081) can be obtained adding 217631053 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140138244 + 77492809 = 11838^2 + 8803^2 .

It is a cyclic number.

It is not a de Polignac number, because 217631053 - 2⁵ = 217631021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217631023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108815526 + 108815527.

It is an arithmetic number, because the mean of its divisors is an integer number (108815527).

Almost surely, 2^217631053 is an apocalyptic number.

It is an amenable number.

217631053 is a deficient number, since it is larger than the sum of its proper divisors (1).

217631053 is an equidigital number, since it uses as much as digits as its factorization.

217631053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 217631053 is about 14752.3236474801. The cubic root of 217631053 is about 601.5064487806.

Adding to 217631053 its reverse (350136712), we get a palindrome (567767765).

The spelling of 217631053 in words is "two hundred seventeen million, six hundred thirty-one thousand, fifty-three".