649538657 has 2 divisors, whose sum is σ = 649538658. Its totient is φ = 649538656.

The previous prime is 649538647. The next prime is 649538677. The reversal of 649538657 is 756835946.

649538657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366760801 + 282777856 = 19151^2 + 16816^2 .

It is a cyclic number.

It is not a de Polignac number, because 649538657 - 2¹⁸ = 649276513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 649538599 and 649538608.

It is not a weakly prime, because it can be changed into another prime (649538647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324769328 + 324769329.

It is an arithmetic number, because the mean of its divisors is an integer number (324769329).

Almost surely, 2^649538657 is an apocalyptic number.

It is an amenable number.

649538657 is a deficient number, since it is larger than the sum of its proper divisors (1).

649538657 is an equidigital number, since it uses as much as digits as its factorization.

649538657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 53.

The square root of 649538657 is about 25486.0482813637. The cubic root of 649538657 is about 866.0341166575.

The spelling of 649538657 in words is "six hundred forty-nine million, five hundred thirty-eight thousand, six hundred fifty-seven".