255521111 has 4 divisors (see below), whose sum is σ = 257148792. Its totient is φ = 253893432.

The previous prime is 255521107. The next prime is 255521141. The reversal of 255521111 is 111125552.

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 255521111 - 2² = 255521107 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 (255521141) 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, 813605 + ... + 813918.

It is an arithmetic number, because the mean of its divisors is an integer number (64287198).

Almost surely, 2^255521111 is an apocalyptic number.

255521111 is a deficient number, since it is larger than the sum of its proper divisors (1627681).

255521111 is a wasteful number, since it uses less digits than its factorization.

255521111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627680.

The product of its digits is 500, while the sum is 23.

The square root of 255521111 is about 15985.0277134574. The cubic root of 255521111 is about 634.5642419258.

Adding to 255521111 its reverse (111125552), we get a palindrome (366646663).

The spelling of 255521111 in words is "two hundred fifty-five million, five hundred twenty-one thousand, one hundred eleven".