255555831 has 4 divisors (see below), whose sum is σ = 340741112. Its totient is φ = 170370552.

The previous prime is 255555821. The next prime is 255555857. The reversal of 255555831 is 138555552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 255555831 - 2⁵ = 255555799 is a prime.

It is a super-2 number, since 2×255555831² = 130617565516201122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 255555831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255555821) 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, 42592636 + ... + 42592641.

It is an arithmetic number, because the mean of its divisors is an integer number (85185278).

Almost surely, 2^255555831 is an apocalyptic number.

255555831 is a deficient number, since it is larger than the sum of its proper divisors (85185281).

255555831 is an equidigital number, since it uses as much as digits as its factorization.

255555831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85185280.

The product of its digits is 150000, while the sum is 39.

The square root of 255555831 is about 15986.1136928273. The cubic root of 255555831 is about 634.5929819812.

The spelling of 255555831 in words is "two hundred fifty-five million, five hundred fifty-five thousand, eight hundred thirty-one".