6616213 has 4 divisors (see below), whose sum is σ = 7005420. Its totient is φ = 6227008.

The previous prime is 6616189. The next prime is 6616217. The reversal of 6616213 is 3126166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3126166 = 2 ⋅1563083.

It can be written as a sum of positive squares in 2 ways, for example, as 4235364 + 2380849 = 2058^2 + 1543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6616213 is a prime.

It is a super-2 number, since 2×6616213² = 87548548922738, which contains 22 as substring.

It is a Duffinian number.

6616213 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6616217) 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, 194578 + ... + 194611.

It is an arithmetic number, because the mean of its divisors is an integer number (1751355).

Almost surely, 2^6616213 is an apocalyptic number.

It is an amenable number.

6616213 is a deficient number, since it is larger than the sum of its proper divisors (389207).

6616213 is a wasteful number, since it uses less digits than its factorization.

6616213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389206.

The product of its digits is 1296, while the sum is 25.

The square root of 6616213 is about 2572.2000311018. The cubic root of 6616213 is about 187.7312157959.

The spelling of 6616213 in words is "six million, six hundred sixteen thousand, two hundred thirteen".