649777 has 2 divisors, whose sum is σ = 649778. Its totient is φ = 649776.

The previous prime is 649771. The next prime is 649783. The reversal of 649777 is 777946.

It is a happy number.

649777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (649771) and next prime (649783).

It can be written as a sum of positive squares in only one way, i.e., 531441 + 118336 = 729^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 649777 - 2³ = 649769 is a prime.

It is a super-3 number, since 3×649777³ = 823027333381381299, which contains 333 as substring.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324888 + 324889.

It is an arithmetic number, because the mean of its divisors is an integer number (324889).

2⁶⁴⁹⁷⁷⁷ is an apocalyptic number.

It is an amenable number.

649777 is a deficient number, since it is larger than the sum of its proper divisors (1).

649777 is an equidigital number, since it uses as much as digits as its factorization.

649777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 40.

The square root of 649777 is about 806.0874642370. The cubic root of 649777 is about 86.6140031794.

The spelling of 649777 in words is "six hundred forty-nine thousand, seven hundred seventy-seven".