655649 has 2 divisors, whose sum is σ = 655650. Its totient is φ = 655648.

The previous prime is 655643. The next prime is 655651. The reversal of 655649 is 946556.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490000 + 165649 = 700^2 + 407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655649 is a prime.

It is a super-2 number, since 2×655649² = 859751222402, which contains 22 as substring.

Together with 655651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (655643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327824 + 327825.

It is an arithmetic number, because the mean of its divisors is an integer number (327825).

2⁶⁵⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

655649 is a deficient number, since it is larger than the sum of its proper divisors (1).

655649 is an equidigital number, since it uses as much as digits as its factorization.

655649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 35.

The square root of 655649 is about 809.7215570800. The cubic root of 655649 is about 86.8741298672.

It can be divided in two parts, 6 and 55649, that added together give a palindrome (55655).

The spelling of 655649 in words is "six hundred fifty-five thousand, six hundred forty-nine".