216825459 has 4 divisors (see below), whose sum is σ = 289100616. Its totient is φ = 144550304.

The previous prime is 216825457. The next prime is 216825461. The reversal of 216825459 is 954528612.

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

It is an interprime number because it is at equal distance from previous prime (216825457) and next prime (216825461).

It is a cyclic number.

It is not a de Polignac number, because 216825459 - 2¹ = 216825457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216825459.

It is not an unprimeable number, because it can be changed into a prime (216825451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36137574 + ... + 36137579.

It is an arithmetic number, because the mean of its divisors is an integer number (72275154).

Almost surely, 2^216825459 is an apocalyptic number.

216825459 is a deficient number, since it is larger than the sum of its proper divisors (72275157).

216825459 is an equidigital number, since it uses as much as digits as its factorization.

216825459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72275156.

The product of its digits is 172800, while the sum is 42.

The square root of 216825459 is about 14724.9943633266. The cubic root of 216825459 is about 600.7633423245.

The spelling of 216825459 in words is "two hundred sixteen million, eight hundred twenty-five thousand, four hundred fifty-nine".