255509121 has 16 divisors (see below), whose sum is σ = 393724800. Its totient is φ = 144363648.

The previous prime is 255509119. The next prime is 255509251. The reversal of 255509121 is 121905552.

It is not a de Polignac number, because 255509121 - 2¹ = 255509119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255509101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66486 + ... + 70223.

It is an arithmetic number, because the mean of its divisors is an integer number (24607800).

Almost surely, 2^255509121 is an apocalyptic number.

255509121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

255509121 is a deficient number, since it is larger than the sum of its proper divisors (138215679).

255509121 is a wasteful number, since it uses less digits than its factorization.

255509121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136808.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 255509121 is about 15984.6526706088. The cubic root of 255509121 is about 634.5543163999.

The spelling of 255509121 in words is "two hundred fifty-five million, five hundred nine thousand, one hundred twenty-one".