616522217 has 4 divisors (see below), whose sum is σ = 620660100. Its totient is φ = 612384336.

The previous prime is 616522213. The next prime is 616522243. The reversal of 616522217 is 712225616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 153239641 + 463282576 = 12379^2 + 21524^2 .

It is a cyclic number.

It is not a de Polignac number, because 616522217 - 2² = 616522213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616522213) 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, 2068718 + ... + 2069015.

It is an arithmetic number, because the mean of its divisors is an integer number (155165025).

Almost surely, 2^616522217 is an apocalyptic number.

It is an amenable number.

616522217 is a deficient number, since it is larger than the sum of its proper divisors (4137883).

616522217 is a wasteful number, since it uses less digits than its factorization.

616522217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4137882.

The product of its digits is 10080, while the sum is 32.

The square root of 616522217 is about 24829.8654245246. The cubic root of 616522217 is about 851.1045465254.

It can be divided in two parts, 6165 and 22217, that added together give a palindrome (28382).

The spelling of 616522217 in words is "six hundred sixteen million, five hundred twenty-two thousand, two hundred seventeen".