216241613 has 4 divisors (see below), whose sum is σ = 247133280. Its totient is φ = 185349948.

The previous prime is 216241591. The next prime is 216241621. The reversal of 216241613 is 316142612.

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 216241613 - 2¹⁰ = 216240589 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 (216241633) 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, 15445823 + ... + 15445836.

It is an arithmetic number, because the mean of its divisors is an integer number (61783320).

Almost surely, 2^216241613 is an apocalyptic number.

It is an amenable number.

216241613 is a deficient number, since it is larger than the sum of its proper divisors (30891667).

216241613 is an equidigital number, since it uses as much as digits as its factorization.

216241613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30891666.

The product of its digits is 1728, while the sum is 26.

The square root of 216241613 is about 14705.1560005326. The cubic root of 216241613 is about 600.2236323780.

Subtracting 216241613 from its reverse (316142612), we obtain a palindrome (99900999).

The spelling of 216241613 in words is "two hundred sixteen million, two hundred forty-one thousand, six hundred thirteen".