216451543 has 16 divisors (see below), whose sum is σ = 270395136. Its totient is φ = 168330240.

The previous prime is 216451519. The next prime is 216451549. The reversal of 216451543 is 345154612.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216451543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216451549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40855 + ... + 45847.

It is an arithmetic number, because the mean of its divisors is an integer number (16899696).

Almost surely, 2^216451543 is an apocalyptic number.

216451543 is a deficient number, since it is larger than the sum of its proper divisors (53943593).

216451543 is a wasteful number, since it uses less digits than its factorization.

216451543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5574.

The product of its digits is 14400, while the sum is 31.

The square root of 216451543 is about 14712.2922415238. The cubic root of 216451543 is about 600.4178043687.

The spelling of 216451543 in words is "two hundred sixteen million, four hundred fifty-one thousand, five hundred forty-three".