216235553 has 2 divisors, whose sum is σ = 216235554. Its totient is φ = 216235552.

The previous prime is 216235483. The next prime is 216235559. The reversal of 216235553 is 355532612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215854864 + 380689 = 14692^2 + 617^2 .

It is a cyclic number.

It is not a de Polignac number, because 216235553 - 2¹⁴ = 216219169 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216235559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108117776 + 108117777.

It is an arithmetic number, because the mean of its divisors is an integer number (108117777).

Almost surely, 2^216235553 is an apocalyptic number.

It is an amenable number.

216235553 is a deficient number, since it is larger than the sum of its proper divisors (1).

216235553 is an equidigital number, since it uses as much as digits as its factorization.

216235553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 32.

The square root of 216235553 is about 14704.9499489118. The cubic root of 216235553 is about 600.2180253949.

The spelling of 216235553 in words is "two hundred sixteen million, two hundred thirty-five thousand, five hundred fifty-three".