216280453 has 4 divisors (see below), whose sum is σ = 221555628. Its totient is φ = 211005280.

The previous prime is 216280423. The next prime is 216280517. The reversal of 216280453 is 354082612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104407524 + 111872929 = 10218^2 + 10577^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216280453 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216280423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2637526 + ... + 2637607.

It is an arithmetic number, because the mean of its divisors is an integer number (55388907).

Almost surely, 2^216280453 is an apocalyptic number.

It is an amenable number.

216280453 is a deficient number, since it is larger than the sum of its proper divisors (5275175).

216280453 is an equidigital number, since it uses as much as digits as its factorization.

216280453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5275174.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 216280453 is about 14706.4765664655. The cubic root of 216280453 is about 600.2595663963.

The spelling of 216280453 in words is "two hundred sixteen million, two hundred eighty thousand, four hundred fifty-three".