5649171857 has 4 divisors (see below), whose sum is σ = 6456196416. Its totient is φ = 4842147300.

The previous prime is 5649171817. The next prime is 5649171907. The reversal of 5649171857 is 7581719465.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7581719465 = 5 ⋅1516343893.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5649171857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5649171799 and 5649171808.

It is not an unprimeable number, because it can be changed into a prime (5649171817) 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, 403512269 + ... + 403512282.

It is an arithmetic number, because the mean of its divisors is an integer number (1614049104).

Almost surely, 2^5649171857 is an apocalyptic number.

It is an amenable number.

5649171857 is a deficient number, since it is larger than the sum of its proper divisors (807024559).

5649171857 is an equidigital number, since it uses as much as digits as its factorization.

5649171857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807024558.

The product of its digits is 2116800, while the sum is 53.

The square root of 5649171857 is about 75160.9729646976. The cubic root of 5649171857 is about 1780.9904701975.

The spelling of 5649171857 in words is "five billion, six hundred forty-nine million, one hundred seventy-one thousand, eight hundred fifty-seven".