255111861 has 8 divisors (see below), whose sum is σ = 343328544. Its totient is φ = 168484880.

The previous prime is 255111823. The next prime is 255111863. The reversal of 255111861 is 168111552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 255111861 - 2⁶ = 255111797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255111863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397050 + ... + 397691.

It is an arithmetic number, because the mean of its divisors is an integer number (42916068).

Almost surely, 2^255111861 is an apocalyptic number.

It is an amenable number.

255111861 is a deficient number, since it is larger than the sum of its proper divisors (88216683).

255111861 is a wasteful number, since it uses less digits than its factorization.

255111861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794851.

The product of its digits is 2400, while the sum is 30.

The square root of 255111861 is about 15972.2215424154. The cubic root of 255111861 is about 634.2252820858.

It can be divided in two parts, 25511 and 1861, that added together give a palindrome (27372).

The spelling of 255111861 in words is "two hundred fifty-five million, one hundred eleven thousand, eight hundred sixty-one".