648381549 has 8 divisors (see below), whose sum is σ = 865065312. Its totient is φ = 431976080.

The previous prime is 648381541. The next prime is 648381553. The reversal of 648381549 is 945183846.

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 648381549 - 2³ = 648381541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 648381498 and 648381507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648381541) 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, 64074 + ... + 73499.

It is an arithmetic number, because the mean of its divisors is an integer number (108133164).

Almost surely, 2^648381549 is an apocalyptic number.

It is an amenable number.

648381549 is a deficient number, since it is larger than the sum of its proper divisors (216683763).

648381549 is a wasteful number, since it uses less digits than its factorization.

648381549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139147.

The product of its digits is 829440, while the sum is 48.

The square root of 648381549 is about 25463.3373500019. The cubic root of 648381549 is about 865.5195511077.

The spelling of 648381549 in words is "six hundred forty-eight million, three hundred eighty-one thousand, five hundred forty-nine".