617424821 has 8 divisors (see below), whose sum is σ = 665193144. Its totient is φ = 569695680.

The previous prime is 617424803. The next prime is 617424833. The reversal of 617424821 is 128424716.

It can be written as a sum of positive squares in 4 ways, for example, as 27615025 + 589809796 = 5255^2 + 24286^2 .

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 617424821 - 2⁶ = 617424757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617424221) 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, 28511 + ... + 45251.

It is an arithmetic number, because the mean of its divisors is an integer number (83149143).

Almost surely, 2^617424821 is an apocalyptic number.

It is an amenable number.

617424821 is a deficient number, since it is larger than the sum of its proper divisors (47768323).

617424821 is a wasteful number, since it uses less digits than its factorization.

617424821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19591.

The product of its digits is 21504, while the sum is 35.

The square root of 617424821 is about 24848.0345500404. The cubic root of 617424821 is about 851.5196901371.

The spelling of 617424821 in words is "six hundred seventeen million, four hundred twenty-four thousand, eight hundred twenty-one".