649577 has 2 divisors, whose sum is σ = 649578. Its totient is φ = 649576.

The previous prime is 649573. The next prime is 649613. The reversal of 649577 is 775946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434281 + 215296 = 659^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 649577 - 2² = 649573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649577.

It is not a weakly prime, because it can be changed into another prime (649573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324788 + 324789.

It is an arithmetic number, because the mean of its divisors is an integer number (324789).

2⁶⁴⁹⁵⁷⁷ is an apocalyptic number.

It is an amenable number.

649577 is a deficient number, since it is larger than the sum of its proper divisors (1).

649577 is an equidigital number, since it uses as much as digits as its factorization.

649577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 38.

The square root of 649577 is about 805.9633986727. The cubic root of 649577 is about 86.6051157313.

It can be divided in two parts, 649 and 577, that multiplied together give a palindrome (374473).

The spelling of 649577 in words is "six hundred forty-nine thousand, five hundred seventy-seven".