255181891 has 4 divisors (see below), whose sum is σ = 255219400. Its totient is φ = 255144384.

The previous prime is 255181841. The next prime is 255181907. The reversal of 255181891 is 198181552.

255181891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 255181891 - 2¹⁵ = 255149123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255181841) 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, 5361 + ... + 23218.

It is an arithmetic number, because the mean of its divisors is an integer number (63804850).

Almost surely, 2^255181891 is an apocalyptic number.

255181891 is a deficient number, since it is larger than the sum of its proper divisors (37509).

255181891 is an equidigital number, since it uses as much as digits as its factorization.

255181891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37508.

The product of its digits is 28800, while the sum is 40.

The square root of 255181891 is about 15974.4136355611. The cubic root of 255181891 is about 634.2833098765.

The spelling of 255181891 in words is "two hundred fifty-five million, one hundred eighty-one thousand, eight hundred ninety-one".