649781449 has 2 divisors, whose sum is σ = 649781450. Its totient is φ = 649781448.

The previous prime is 649781417. The next prime is 649781467. The reversal of 649781449 is 944187946.

649781449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582015625 + 67765824 = 24125^2 + 8232^2 .

It is a cyclic number.

It is not a de Polignac number, because 649781449 - 2⁵ = 649781417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 649781396 and 649781405.

It is not a weakly prime, because it can be changed into another prime (649784449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324890724 + 324890725.

It is an arithmetic number, because the mean of its divisors is an integer number (324890725).

Almost surely, 2^649781449 is an apocalyptic number.

It is an amenable number.

649781449 is a deficient number, since it is larger than the sum of its proper divisors (1).

649781449 is an equidigital number, since it uses as much as digits as its factorization.

649781449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 52.

The square root of 649781449 is about 25490.8110698738. The cubic root of 649781449 is about 866.1420085999.

The spelling of 649781449 in words is "six hundred forty-nine million, seven hundred eighty-one thousand, four hundred forty-nine".