648415549 has 2 divisors, whose sum is σ = 648415550. Its totient is φ = 648415548.

The previous prime is 648415541. The next prime is 648415567. The reversal of 648415549 is 945514846.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 430853049 + 217562500 = 20757^2 + 14750^2 .

It is a cyclic number.

It is not a de Polignac number, because 648415549 - 2³ = 648415541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 648415499 and 648415508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648415541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324207774 + 324207775.

It is an arithmetic number, because the mean of its divisors is an integer number (324207775).

Almost surely, 2^648415549 is an apocalyptic number.

It is an amenable number.

648415549 is a deficient number, since it is larger than the sum of its proper divisors (1).

648415549 is an equidigital number, since it uses as much as digits as its factorization.

648415549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691200, while the sum is 46.

The square root of 648415549 is about 25464.0049677972. The cubic root of 648415549 is about 865.5346796229.

The spelling of 648415549 in words is "six hundred forty-eight million, four hundred fifteen thousand, five hundred forty-nine".