649657 has 2 divisors, whose sum is σ = 649658. Its totient is φ = 649656.

The previous prime is 649651. The next prime is 649661. The reversal of 649657 is 756946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395641 + 254016 = 629^2 + 504^2 .

It is a cyclic number.

It is not a de Polignac number, because 649657 - 2⁷ = 649529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324828 + 324829.

It is an arithmetic number, because the mean of its divisors is an integer number (324829).

2⁶⁴⁹⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

649657 is a deficient number, since it is larger than the sum of its proper divisors (1).

649657 is an equidigital number, since it uses as much as digits as its factorization.

649657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 649657 is about 806.0130271900. The cubic root of 649657 is about 86.6086709294.

The spelling of 649657 in words is "six hundred forty-nine thousand, six hundred fifty-seven".