648771841 has 3 divisors (see below), whose sum is σ = 648797313. Its totient is φ = 648746370.

The previous prime is 648771803. The next prime is 648771859. The reversal of 648771841 is 148177846.

The square root of 648771841 is 25471.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 648771841 - 2⁷ = 648771713 is a prime.

It is a super-3 number, since 3×648771841³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648771791 and 648771800.

It is not an unprimeable number, because it can be changed into a prime (648771881) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12736 + ... + 38206.

It is an arithmetic number, because the mean of its divisors is an integer number (216265771).

Almost surely, 2^648771841 is an apocalyptic number.

648771841 is the 25471-st square number.

648771841 is the 12736-th centered octagonal number.

It is an amenable number.

648771841 is a deficient number, since it is larger than the sum of its proper divisors (25472).

648771841 is an frugal number, since it uses more digits than its factorization.

648771841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50942 (or 25471 counting only the distinct ones).

The product of its digits is 301056, while the sum is 46.

The cubic root of 648771841 is about 865.6931822047.

The spelling of 648771841 in words is "six hundred forty-eight million, seven hundred seventy-one thousand, eight hundred forty-one".