616955609 has 4 divisors (see below), whose sum is σ = 617055204. Its totient is φ = 616856016.

The previous prime is 616955597. The next prime is 616955617. The reversal of 616955609 is 906559616.

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 66912400 + 550043209 = 8180^2 + 23453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616955609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616955639) 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, 39842 + ... + 53115.

It is an arithmetic number, because the mean of its divisors is an integer number (154263801).

Almost surely, 2^616955609 is an apocalyptic number.

It is an amenable number.

616955609 is a deficient number, since it is larger than the sum of its proper divisors (99595).

616955609 is an equidigital number, since it uses as much as digits as its factorization.

616955609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99594.

The product of its (nonzero) digits is 437400, while the sum is 47.

The square root of 616955609 is about 24838.5911234917. The cubic root of 616955609 is about 851.3039313397.

The spelling of 616955609 in words is "six hundred sixteen million, nine hundred fifty-five thousand, six hundred nine".