648381541 has 2 divisors, whose sum is σ = 648381542. Its totient is φ = 648381540.

The previous prime is 648381521. The next prime is 648381553. The reversal of 648381541 is 145183846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 410913441 + 237468100 = 20271^2 + 15410^2 .

It is a cyclic number.

It is not a de Polignac number, because 648381541 - 2⁵ = 648381509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 648381494 and 648381503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648381521) 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 as a sum of consecutive naturals, namely, 324190770 + 324190771.

It is an arithmetic number, because the mean of its divisors is an integer number (324190771).

Almost surely, 2^648381541 is an apocalyptic number.

It is an amenable number.

648381541 is a deficient number, since it is larger than the sum of its proper divisors (1).

648381541 is an equidigital number, since it uses as much as digits as its factorization.

648381541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 40.

The square root of 648381541 is about 25463.3371929133. The cubic root of 648381541 is about 865.5195475480.

The spelling of 648381541 in words is "six hundred forty-eight million, three hundred eighty-one thousand, five hundred forty-one".