616561313 has 8 divisors (see below), whose sum is σ = 619631520. Its totient is φ = 613499040.

The previous prime is 616561277. The next prime is 616561339. The reversal of 616561313 is 313165616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 616561313 - 2⁶ = 616561249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 616561313.

It is not an unprimeable number, because it can be changed into a prime (616561613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202718 + ... + 205736.

It is an arithmetic number, because the mean of its divisors is an integer number (77453940).

Almost surely, 2^616561313 is an apocalyptic number.

It is an amenable number.

616561313 is a deficient number, since it is larger than the sum of its proper divisors (3070207).

616561313 is a wasteful number, since it uses less digits than its factorization.

616561313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967.

The product of its digits is 9720, while the sum is 32.

The square root of 616561313 is about 24830.6526897704. The cubic root of 616561313 is about 851.1225367286.

The spelling of 616561313 in words is "six hundred sixteen million, five hundred sixty-one thousand, three hundred thirteen".