216553 has 2 divisors, whose sum is σ = 216554. Its totient is φ = 216552.

The previous prime is 216551. The next prime is 216569. The reversal of 216553 is 355612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186624 + 29929 = 432^2 + 173^2 .

It is a cyclic number.

It is not a de Polignac number, because 216553 - 2¹ = 216551 is a prime.

Together with 216551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (216551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108276 + 108277.

It is an arithmetic number, because the mean of its divisors is an integer number (108277).

2²¹⁶⁵⁵³ is an apocalyptic number.

It is an amenable number.

216553 is a deficient number, since it is larger than the sum of its proper divisors (1).

216553 is an equidigital number, since it uses as much as digits as its factorization.

216553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 22.

The square root of 216553 is about 465.3525545218. The cubic root of 216553 is about 60.0511600688.

The spelling of 216553 in words is "two hundred sixteen thousand, five hundred fifty-three".