649625 has 8 divisors (see below), whose sum is σ = 810888. Its totient is φ = 519600.

The previous prime is 649619. The next prime is 649631. The reversal of 649625 is 526946.

It is an interprime number because it is at equal distance from previous prime (649619) and next prime (649631).

It can be written as a sum of positive squares in 4 ways, for example, as 34969 + 614656 = 187^2 + 784^2 .

It is not a de Polignac number, because 649625 - 2¹² = 645529 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649591 and 649600.

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 649625.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2474 + ... + 2723.

It is an arithmetic number, because the mean of its divisors is an integer number (101361).

2⁶⁴⁹⁶²⁵ is an apocalyptic number.

It is an amenable number.

649625 is a deficient number, since it is larger than the sum of its proper divisors (161263).

649625 is an equidigital number, since it uses as much as digits as its factorization.

649625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5212 (or 5202 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 649625 is about 805.9931761498. The cubic root of 649625 is about 86.6072488852.

The spelling of 649625 in words is "six hundred forty-nine thousand, six hundred twenty-five".