616516213 has 4 divisors (see below), whose sum is σ = 616566060. Its totient is φ = 616466368.

The previous prime is 616516211. The next prime is 616516223. The reversal of 616516213 is 312615616.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 218832849 + 397683364 = 14793^2 + 19942^2 .

It is a cyclic number.

It is not a de Polignac number, because 616516213 - 2¹ = 616516211 is a prime.

It is a super-2 number, since 2×616516213² = 760184481783722738, 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 (616516211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9231 + ... + 36307.

It is an arithmetic number, because the mean of its divisors is an integer number (154141515).

Almost surely, 2^616516213 is an apocalyptic number.

It is an amenable number.

616516213 is a deficient number, since it is larger than the sum of its proper divisors (49847).

616516213 is a wasteful number, since it uses less digits than its factorization.

616516213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49846.

The product of its digits is 6480, while the sum is 31.

The square root of 616516213 is about 24829.7445214404. The cubic root of 616516213 is about 851.1017836899.

The spelling of 616516213 in words is "six hundred sixteen million, five hundred sixteen thousand, two hundred thirteen".