616221609 has 16 divisors (see below), whose sum is σ = 854256000. Its totient is φ = 394644096.

The previous prime is 616221601. The next prime is 616221629. The reversal of 616221609 is 906122616.

It is not a de Polignac number, because 616221609 - 2³ = 616221601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 616221609.

It is not an unprimeable number, because it can be changed into a prime (616221601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 484 + ... + 35109.

It is an arithmetic number, because the mean of its divisors is an integer number (53391000).

Almost surely, 2^616221609 is an apocalyptic number.

It is an amenable number.

616221609 is a deficient number, since it is larger than the sum of its proper divisors (238034391).

616221609 is a wasteful number, since it uses less digits than its factorization.

616221609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35824.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 616221609 is about 24823.8113310587. The cubic root of 616221609 is about 850.9661949664.

The spelling of 616221609 in words is "six hundred sixteen million, two hundred twenty-one thousand, six hundred nine".