649525 has 6 divisors (see below), whose sum is σ = 805442. Its totient is φ = 519600.

The previous prime is 649511. The next prime is 649529. The reversal of 649525 is 525946.

It can be written as a sum of positive squares in 3 ways, for example, as 45796 + 603729 = 214^2 + 777^2 .

It is not a de Polignac number, because 649525 - 2¹¹ = 647477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649529) 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, 12966 + ... + 13015.

2⁶⁴⁹⁵²⁵ is an apocalyptic number.

It is an amenable number.

649525 is a deficient number, since it is larger than the sum of its proper divisors (155917).

649525 is a wasteful number, since it uses less digits than its factorization.

649525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25991 (or 25986 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 649525 is about 805.9311384976. The cubic root of 649525 is about 86.6028046959.

It can be divided in two parts, 649 and 525, that multiplied together give a triangular number (340725 = T₈₂₅).

The spelling of 649525 in words is "six hundred forty-nine thousand, five hundred twenty-five".