649457 has 2 divisors, whose sum is σ = 649458. Its totient is φ = 649456.

The previous prime is 649427. The next prime is 649469. The reversal of 649457 is 754946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 516961 + 132496 = 719^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 649457 - 2¹⁰ = 648433 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649457.

It is not a weakly prime, because it can be changed into another prime (649427) 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, 324728 + 324729.

It is an arithmetic number, because the mean of its divisors is an integer number (324729).

2⁶⁴⁹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

649457 is a deficient number, since it is larger than the sum of its proper divisors (1).

649457 is an equidigital number, since it uses as much as digits as its factorization.

649457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 649457 is about 805.8889501662. Note that the first 3 decimals coincide. The cubic root of 649457 is about 86.5997823867.

The spelling of 649457 in words is "six hundred forty-nine thousand, four hundred fifty-seven".