649057 has 4 divisors (see below), whose sum is σ = 651456. Its totient is φ = 646660.

The previous prime is 649039. The next prime is 649063. The reversal of 649057 is 750946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649057 - 2¹⁵ = 616289 is a prime.

It is a Duffinian number.

649057 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (649007) 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 3 ways as a sum of consecutive naturals, for example, 733 + ... + 1354.

It is an arithmetic number, because the mean of its divisors is an integer number (162864).

2⁶⁴⁹⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

649057 is a deficient number, since it is larger than the sum of its proper divisors (2399).

649057 is a wasteful number, since it uses less digits than its factorization.

649057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 649057 is about 805.6407387912. The cubic root of 649057 is about 86.5819998253.

The spelling of 649057 in words is "six hundred forty-nine thousand, fifty-seven".