255321551 has 4 divisors (see below), whose sum is σ = 266422512. Its totient is φ = 244220592.

The previous prime is 255321527. The next prime is 255321553. The reversal of 255321551 is 155123552.

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 255321551 - 2¹⁸ = 255059407 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 (255321553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5550446 + ... + 5550491.

It is an arithmetic number, because the mean of its divisors is an integer number (66605628).

Almost surely, 2^255321551 is an apocalyptic number.

255321551 is a deficient number, since it is larger than the sum of its proper divisors (11100961).

255321551 is a wasteful number, since it uses less digits than its factorization.

255321551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11100960.

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

The square root of 255321551 is about 15978.7844030765. The cubic root of 255321551 is about 634.3990023225.

The spelling of 255321551 in words is "two hundred fifty-five million, three hundred twenty-one thousand, five hundred fifty-one".