255501 has 8 divisors (see below), whose sum is σ = 378560. Its totient is φ = 170316.

The previous prime is 255499. The next prime is 255503. The reversal of 255501 is 105552.

It is an interprime number because it is at equal distance from previous prime (255499) and next prime (255503).

It is not a de Polignac number, because 255501 - 2¹ = 255499 is a prime.

It is a super-2 number, since 2×255501² = 130561522002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4705 + ... + 4758.

It is an arithmetic number, because the mean of its divisors is an integer number (47320).

2²⁵⁵⁵⁰¹ is an apocalyptic number.

It is an amenable number.

255501 is a deficient number, since it is larger than the sum of its proper divisors (123059).

255501 is an equidigital number, since it uses as much as digits as its factorization.

255501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9472 (or 9466 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 255501 is about 505.4710674213. The cubic root of 255501 is about 63.4547593522.

The spelling of 255501 in words is "two hundred fifty-five thousand, five hundred one".