216504813 has 8 divisors (see below), whose sum is σ = 329912128. Its totient is φ = 123717024.

The previous prime is 216504737. The next prime is 216504817. The reversal of 216504813 is 318405612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216504813 - 2⁸ = 216504557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216504817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5154856 + ... + 5154897.

It is an arithmetic number, because the mean of its divisors is an integer number (41239016).

Almost surely, 2^216504813 is an apocalyptic number.

It is an amenable number.

216504813 is a deficient number, since it is larger than the sum of its proper divisors (113407315).

216504813 is a wasteful number, since it uses less digits than its factorization.

216504813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10309763.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 216504813 is about 14714.1025210510. The cubic root of 216504813 is about 600.4670557816.

The spelling of 216504813 in words is "two hundred sixteen million, five hundred four thousand, eight hundred thirteen".