255503551 has 4 divisors (see below), whose sum is σ = 257984272. Its totient is φ = 253022832.

The previous prime is 255503539. The next prime is 255503569. The reversal of 255503551 is 155305552.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 255503551 - 2²³ = 247114943 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 (255503851) 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, 1240206 + ... + 1240411.

It is an arithmetic number, because the mean of its divisors is an integer number (64496068).

Almost surely, 2^255503551 is an apocalyptic number.

255503551 is a deficient number, since it is larger than the sum of its proper divisors (2480721).

255503551 is a wasteful number, since it uses less digits than its factorization.

255503551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480720.

The product of its (nonzero) digits is 18750, while the sum is 31.

The square root of 255503551 is about 15984.4784400368. The cubic root of 255503551 is about 634.5497053535.

The spelling of 255503551 in words is "two hundred fifty-five million, five hundred three thousand, five hundred fifty-one".