255643501 has 4 divisors (see below), whose sum is σ = 270681372. Its totient is φ = 240605632.

The previous prime is 255643469. The next prime is 255643517. The reversal of 255643501 is 105346552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 237961476 + 17682025 = 15426^2 + 4205^2 .

It is a cyclic number.

It is not a de Polignac number, because 255643501 - 2⁵ = 255643469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255643601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7518910 + ... + 7518943.

It is an arithmetic number, because the mean of its divisors is an integer number (67670343).

Almost surely, 2^255643501 is an apocalyptic number.

It is an amenable number.

255643501 is a deficient number, since it is larger than the sum of its proper divisors (15037871).

255643501 is a wasteful number, since it uses less digits than its factorization.

255643501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15037870.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 255643501 is about 15988.8555250212. The cubic root of 255643501 is about 634.6655406934.

The spelling of 255643501 in words is "two hundred fifty-five million, six hundred forty-three thousand, five hundred one".