255375221 has 4 divisors (see below), whose sum is σ = 262277292. Its totient is φ = 248473152.

The previous prime is 255375217. The next prime is 255375229. The reversal of 255375221 is 122573552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 243048100 + 12327121 = 15590^2 + 3511^2 .

It is a cyclic number.

It is not a de Polignac number, because 255375221 - 2² = 255375217 is a prime.

It is a super-3 number, since 3×255375221³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255375229) 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, 3450980 + ... + 3451053.

It is an arithmetic number, because the mean of its divisors is an integer number (65569323).

Almost surely, 2^255375221 is an apocalyptic number.

It is an amenable number.

255375221 is a deficient number, since it is larger than the sum of its proper divisors (6902071).

255375221 is an equidigital number, since it uses as much as digits as its factorization.

255375221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6902070.

The product of its digits is 21000, while the sum is 32.

The square root of 255375221 is about 15980.4637291913. The cubic root of 255375221 is about 634.4434505995.

The spelling of 255375221 in words is "two hundred fifty-five million, three hundred seventy-five thousand, two hundred twenty-one".