648172849 has 8 divisors (see below), whose sum is σ = 658363680. Its totient is φ = 638046816.

The previous prime is 648172843. The next prime is 648172871. The reversal of 648172849 is 948271846.

It is a happy number.

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 648172849 - 2⁹ = 648172337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648172843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4162 + ... + 36244.

It is an arithmetic number, because the mean of its divisors is an integer number (82295460).

Almost surely, 2^648172849 is an apocalyptic number.

It is an amenable number.

648172849 is a deficient number, since it is larger than the sum of its proper divisors (10190831).

648172849 is a wasteful number, since it uses less digits than its factorization.

648172849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32399.

The product of its digits is 774144, while the sum is 49.

The square root of 648172849 is about 25459.2389713440. The cubic root of 648172849 is about 865.4266771331.

The spelling of 648172849 in words is "six hundred forty-eight million, one hundred seventy-two thousand, eight hundred forty-nine".