4198521617 has 8 divisors (see below), whose sum is σ = 4284325224. Its totient is φ = 4112962048.

The previous prime is 4198521601. The next prime is 4198521619. The reversal of 4198521617 is 7161258914.

It is a Cunningham number, because it is equal to 64796²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 976937536 + 3221584081 = 31256^2 + 56759^2 .

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 4198521617 - 2⁴ = 4198521601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4198521619) 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, 26048 + ... + 95265.

It is an arithmetic number, because the mean of its divisors is an integer number (535540653).

Almost surely, 2^4198521617 is an apocalyptic number.

It is an amenable number.

4198521617 is a deficient number, since it is larger than the sum of its proper divisors (85803607).

4198521617 is a wasteful number, since it uses less digits than its factorization.

4198521617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122019.

The product of its digits is 120960, while the sum is 44.

The square root of 4198521617 is about 64796.0000077165. Note that the first 5 decimals coincide. The cubic root of 4198521617 is about 1613.2393170242.

The spelling of 4198521617 in words is "four billion, one hundred ninety-eight million, five hundred twenty-one thousand, six hundred seventeen".