616345421 has 16 divisors (see below), whose sum is σ = 682846848. Its totient is φ = 553344000.

The previous prime is 616345399. The next prime is 616345423. The reversal of 616345421 is 124543616.

It is a cyclic number.

It is not a de Polignac number, because 616345421 - 2¹⁸ = 616083277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616345423) 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 15 ways as a sum of consecutive naturals, for example, 154826 + ... + 158756.

It is an arithmetic number, because the mean of its divisors is an integer number (42677928).

Almost surely, 2^616345421 is an apocalyptic number.

It is an amenable number.

616345421 is a deficient number, since it is larger than the sum of its proper divisors (66501427).

616345421 is a wasteful number, since it uses less digits than its factorization.

616345421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4372.

The product of its digits is 17280, while the sum is 32.

The square root of 616345421 is about 24826.3050210860. The cubic root of 616345421 is about 851.0231835397.

The spelling of 616345421 in words is "six hundred sixteen million, three hundred forty-five thousand, four hundred twenty-one".