216959513 has 4 divisors (see below), whose sum is σ = 218987280. Its totient is φ = 214931748.

The previous prime is 216959497. The next prime is 216959549. The reversal of 216959513 is 315959612.

It is a happy number.

216959513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216959513 - 2⁴ = 216959497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216959573) 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, 1013723 + ... + 1013936.

It is an arithmetic number, because the mean of its divisors is an integer number (54746820).

Almost surely, 2^216959513 is an apocalyptic number.

It is an amenable number.

216959513 is a deficient number, since it is larger than the sum of its proper divisors (2027767).

216959513 is a wasteful number, since it uses less digits than its factorization.

216959513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2027766.

The product of its digits is 72900, while the sum is 41.

The square root of 216959513 is about 14729.5455802275. The cubic root of 216959513 is about 600.8871256633.

Subtracting 216959513 from its reverse (315959612), we obtain a palindrome (99000099).

The spelling of 216959513 in words is "two hundred sixteen million, nine hundred fifty-nine thousand, five hundred thirteen".