216552959 has 4 divisors (see below), whose sum is σ = 247489104. Its totient is φ = 185616816.

The previous prime is 216552943. The next prime is 216552977. The reversal of 216552959 is 959255612.

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

It is not a de Polignac number, because 216552959 - 2⁴ = 216552943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216552559) 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, 15468062 + ... + 15468075.

It is an arithmetic number, because the mean of its divisors is an integer number (61872276).

Almost surely, 2^216552959 is an apocalyptic number.

216552959 is a deficient number, since it is larger than the sum of its proper divisors (30936145).

216552959 is an equidigital number, since it uses as much as digits as its factorization.

216552959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30936144.

The product of its digits is 243000, while the sum is 44.

The square root of 216552959 is about 14715.7384796007. The cubic root of 216552959 is about 600.5115627893.

The spelling of 216552959 in words is "two hundred sixteen million, five hundred fifty-two thousand, nine hundred fifty-nine".