216935813 has 8 divisors (see below), whose sum is σ = 218241408. Its totient is φ = 215634384.

The previous prime is 216935791. The next prime is 216935821. The reversal of 216935813 is 318539612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 216935813 - 2²⁰ = 215887237 is a prime.

It is a super-2 number, since 2×216935813² = 94122293923941938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216935843) 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, 223856 + ... + 224822.

It is an arithmetic number, because the mean of its divisors is an integer number (27280176).

Almost surely, 2^216935813 is an apocalyptic number.

It is an amenable number.

216935813 is a deficient number, since it is larger than the sum of its proper divisors (1305595).

216935813 is an equidigital number, since it uses as much as digits as its factorization.

216935813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083.

The product of its digits is 38880, while the sum is 38.

The square root of 216935813 is about 14728.7410527852. The cubic root of 216935813 is about 600.8652451701.

The spelling of 216935813 in words is "two hundred sixteen million, nine hundred thirty-five thousand, eight hundred thirteen".