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255601 = 2331097

255601 has 4 divisors (see below), whose sum is σ = 256932. Its totient is φ = 254272.

The previous prime is 255589. The next prime is 255613. The reversal of 255601 is 106552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (255589) and next prime (255613).

It can be written as a sum of positive squares in 2 ways, for example, as 62001 + 193600 = 249^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 255601 - 27 = 255473 is a prime.

It is a Duffinian number.

255601 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255641) 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 3 ways as a sum of consecutive naturals, for example, 316 + ... + 781.

It is an arithmetic number, because the mean of its divisors is an integer number (64233).

2255601 is an apocalyptic number.

It is an amenable number.

255601 is a deficient number, since it is larger than the sum of its proper divisors (1331).

255601 is a wasteful number, since it uses less digits than its factorization.

255601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 255601 is about 505.5699753743. The cubic root of 255601 is about 63.4630367474.

The spelling of 255601 in words is "two hundred fifty-five thousand, six hundred one".

Divisors: 1 233 1097 255601