255551321 has 8 divisors (see below), whose sum is σ = 275265024. Its totient is φ = 236554560.

The previous prime is 255551299. The next prime is 255551347. The reversal of 255551321 is 123155552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255551321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255551221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178496 + ... + 179921.

It is an arithmetic number, because the mean of its divisors is an integer number (34408128).

Almost surely, 2^255551321 is an apocalyptic number.

It is an amenable number.

255551321 is a deficient number, since it is larger than the sum of its proper divisors (19713703).

255551321 is a wasteful number, since it uses less digits than its factorization.

255551321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358471.

The product of its digits is 7500, while the sum is 29.

The square root of 255551321 is about 15985.9726322798. The cubic root of 255551321 is about 634.5892489011.

The spelling of 255551321 in words is "two hundred fifty-five million, five hundred fifty-one thousand, three hundred twenty-one".