255551481 has 24 divisors (see below), whose sum is σ = 374105160. Its totient is φ = 168086016.

The previous prime is 255551477. The next prime is 255551503. The reversal of 255551481 is 184155552.

255551481 is a `hidden beast` number, since 25 + 5 + 551 + 4 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3027600 + 252523881 = 1740^2 + 15891^2 .

It is not a de Polignac number, because 255551481 - 2² = 255551477 is a prime.

It is a super-2 number, since 2×255551481² = 130613118882586722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (255551581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330211 + ... + 330983.

It is an arithmetic number, because the mean of its divisors is an integer number (15587715).

Almost surely, 2^255551481 is an apocalyptic number.

It is an amenable number.

255551481 is a deficient number, since it is larger than the sum of its proper divisors (118553679).

255551481 is a wasteful number, since it uses less digits than its factorization.

255551481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1222 counting only the distinct ones).

The product of its digits is 40000, while the sum is 36.

The square root of 255551481 is about 15985.9776366665. The cubic root of 255551481 is about 634.5893813393.

The spelling of 255551481 in words is "two hundred fifty-five million, five hundred fifty-one thousand, four hundred eighty-one".