216355513 has 4 divisors (see below), whose sum is σ = 236024208. Its totient is φ = 196686820.

The previous prime is 216355511. The next prime is 216355543. The reversal of 216355513 is 315553612.

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 not a de Polignac number, because 216355513 - 2¹ = 216355511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216355511) 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, 9834331 + ... + 9834352.

It is an arithmetic number, because the mean of its divisors is an integer number (59006052).

Almost surely, 2^216355513 is an apocalyptic number.

It is an amenable number.

216355513 is a deficient number, since it is larger than the sum of its proper divisors (19668695).

216355513 is a wasteful number, since it uses less digits than its factorization.

216355513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19668694.

The product of its digits is 13500, while the sum is 31.

The square root of 216355513 is about 14709.0282819770. The cubic root of 216355513 is about 600.3289982710.

The spelling of 216355513 in words is "two hundred sixteen million, three hundred fifty-five thousand, five hundred thirteen".