216013 has 4 divisors (see below), whose sum is σ = 246880. Its totient is φ = 185148.

The previous prime is 215983. The next prime is 216023. The reversal of 216013 is 310612.

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 216013 - 2⁵ = 215981 is a prime.

It is a Duffinian number.

216013 is a lucky number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 215984 and 216002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15423 + ... + 15436.

It is an arithmetic number, because the mean of its divisors is an integer number (61720).

216013 is a Friedman number, since it can be written as 60^3+12+1, using all its digits and the basic arithmetic operations.

2²¹⁶⁰¹³ is an apocalyptic number.

It is an amenable number.

216013 is a deficient number, since it is larger than the sum of its proper divisors (30867).

216013 is an equidigital number, since it uses as much as digits as its factorization.

216013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30866.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 216013 is about 464.7719871077. The cubic root of 216013 is about 60.0012036796.

Subtracting from 216013 its sum of digits (13), we obtain a cube (216000 = 60³).

Adding to 216013 its reverse (310612), we get a palindrome (526625).

The spelling of 216013 in words is "two hundred sixteen thousand, thirteen".