216803453 has 2 divisors, whose sum is σ = 216803454. Its totient is φ = 216803452.

The previous prime is 216803437. The next prime is 216803467. The reversal of 216803453 is 354308612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153091129 + 63712324 = 12373^2 + 7982^2 .

It is a cyclic number.

It is not a de Polignac number, because 216803453 - 2⁴ = 216803437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216803423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108401726 + 108401727.

It is an arithmetic number, because the mean of its divisors is an integer number (108401727).

Almost surely, 2^216803453 is an apocalyptic number.

It is an amenable number.

216803453 is a deficient number, since it is larger than the sum of its proper divisors (1).

216803453 is an equidigital number, since it uses as much as digits as its factorization.

216803453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 216803453 is about 14724.2471114825. The cubic root of 216803453 is about 600.7430174582.

The spelling of 216803453 in words is "two hundred sixteen million, eight hundred three thousand, four hundred fifty-three".