255991105 has 4 divisors (see below), whose sum is σ = 307189332. Its totient is φ = 204792880.

The previous prime is 255991069. The next prime is 255991111. The reversal of 255991105 is 501199552.

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 94497841 + 161493264 = 9721^2 + 12708^2 .

It is not a de Polignac number, because 255991105 - 2²³ = 247602497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25599106 + ... + 25599115.

It is an arithmetic number, because the mean of its divisors is an integer number (76797333).

Almost surely, 2^255991105 is an apocalyptic number.

It is an amenable number.

255991105 is a deficient number, since it is larger than the sum of its proper divisors (51198227).

255991105 is an equidigital number, since it uses as much as digits as its factorization.

255991105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51198226.

The product of its (nonzero) digits is 20250, while the sum is 37.

The square root of 255991105 is about 15999.7220288354. The cubic root of 255991105 is about 634.9530665707.

The spelling of 255991105 in words is "two hundred fifty-five million, nine hundred ninety-one thousand, one hundred five".