649557 has 6 divisors (see below), whose sum is σ = 938262. Its totient is φ = 433032.

The previous prime is 649541. The next prime is 649559. The reversal of 649557 is 755946.

649557 is a `hidden beast` number, since 649 + 5 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 427716 + 221841 = 654^2 + 471^2 .

It is not a de Polignac number, because 649557 - 2⁴ = 649541 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649557.

It is not an unprimeable number, because it can be changed into a prime (649559) 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 in 5 ways as a sum of consecutive naturals, for example, 36078 + ... + 36095.

It is an arithmetic number, because the mean of its divisors is an integer number (156377).

2⁶⁴⁹⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

649557 is a deficient number, since it is larger than the sum of its proper divisors (288705).

649557 is a wasteful number, since it uses less digits than its factorization.

649557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72179 (or 72176 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 649557 is about 805.9509910658. The cubic root of 649557 is about 86.6042268861.

The spelling of 649557 in words is "six hundred forty-nine thousand, five hundred fifty-seven".