255521251 has 6 divisors (see below), whose sum is σ = 264030756. Its totient is φ = 247277700.

The previous prime is 255521249. The next prime is 255521309. The reversal of 255521251 is 152125552.

It is not a de Polignac number, because 255521251 - 2¹ = 255521249 is a prime.

It is a super-2 number, since 2×255521251² = 130582219425210002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255521221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 131985 + ... + 133906.

It is an arithmetic number, because the mean of its divisors is an integer number (44005126).

Almost surely, 2^255521251 is an apocalyptic number.

255521251 is a deficient number, since it is larger than the sum of its proper divisors (8509505).

255521251 is an equidigital number, since it uses as much as digits as its factorization.

255521251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265953 (or 265922 counting only the distinct ones).

The product of its digits is 5000, while the sum is 28.

The square root of 255521251 is about 15985.0320925546. The cubic root of 255521251 is about 634.5643578184.

The spelling of 255521251 in words is "two hundred fifty-five million, five hundred twenty-one thousand, two hundred fifty-one".