255649 has 2 divisors, whose sum is σ = 255650. Its totient is φ = 255648.

The previous prime is 255641. The next prime is 255653. The reversal of 255649 is 946552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165649 + 90000 = 407^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 255649 - 2³ = 255641 is a prime.

It is a super-2 number, since 2×255649² = 130712822402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 255649.

It is not a weakly prime, because it can be changed into another prime (255641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127824 + 127825.

It is an arithmetic number, because the mean of its divisors is an integer number (127825).

2²⁵⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

255649 is a deficient number, since it is larger than the sum of its proper divisors (1).

255649 is an equidigital number, since it uses as much as digits as its factorization.

255649 is an evil number, because the sum of its binary digits is even.

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

The square root of 255649 is about 505.6174443193. The cubic root of 255649 is about 63.4670091302.

The spelling of 255649 in words is "two hundred fifty-five thousand, six hundred forty-nine".