255156861 has 4 divisors (see below), whose sum is σ = 340209152. Its totient is φ = 170104572.

The previous prime is 255156841. The next prime is 255156919. The reversal of 255156861 is 168651552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 255156861 - 2¹⁰ = 255155837 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 (255156821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42526141 + ... + 42526146.

It is an arithmetic number, because the mean of its divisors is an integer number (85052288).

Almost surely, 2^255156861 is an apocalyptic number.

It is an amenable number.

255156861 is a deficient number, since it is larger than the sum of its proper divisors (85052291).

255156861 is an equidigital number, since it uses as much as digits as its factorization.

255156861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85052290.

The product of its digits is 72000, while the sum is 39.

The square root of 255156861 is about 15973.6301760120. The cubic root of 255156861 is about 634.2625709044.

The spelling of 255156861 in words is "two hundred fifty-five million, one hundred fifty-six thousand, eight hundred sixty-one".