255996321 has 32 divisors (see below), whose sum is σ = 398331648. Its totient is φ = 143216640.

The previous prime is 255996287. The next prime is 255996341. The reversal of 255996321 is 123699552.

It is not a de Polignac number, because 255996321 - 2¹⁸ = 255734177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255996341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 431401 + ... + 431993.

It is an arithmetic number, because the mean of its divisors is an integer number (12447864).

Almost surely, 2^255996321 is an apocalyptic number.

255996321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

255996321 is a deficient number, since it is larger than the sum of its proper divisors (142335327).

255996321 is a wasteful number, since it uses less digits than its factorization.

255996321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001.

The product of its digits is 145800, while the sum is 42.

The square root of 255996321 is about 15999.8850308369. The cubic root of 255996321 is about 634.9573790808.

The spelling of 255996321 in words is "two hundred fifty-five million, nine hundred ninety-six thousand, three hundred twenty-one".