255221243 has 16 divisors (see below), whose sum is σ = 273196800. Its totient is φ = 237736800.

The previous prime is 255221237. The next prime is 255221251. The reversal of 255221243 is 342122552.

It is a cyclic number.

It is not a de Polignac number, because 255221243 - 2¹² = 255217147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255221203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343130 + ... + 343872.

It is an arithmetic number, because the mean of its divisors is an integer number (17074800).

Almost surely, 2^255221243 is an apocalyptic number.

255221243 is a deficient number, since it is larger than the sum of its proper divisors (17975557).

255221243 is a wasteful number, since it uses less digits than its factorization.

255221243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042.

The product of its digits is 4800, while the sum is 26.

The square root of 255221243 is about 15975.6453077802. The cubic root of 255221243 is about 634.3159128090.

Adding to 255221243 its reverse (342122552), we get a palindrome (597343795).

The spelling of 255221243 in words is "two hundred fifty-five million, two hundred twenty-one thousand, two hundred forty-three".