1855278241 has 4 divisors (see below), whose sum is σ = 1859466672. Its totient is φ = 1851089812.

The previous prime is 1855278203. The next prime is 1855278251. The reversal of 1855278241 is 1428725581.

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 a cyclic number.

It is not a de Polignac number, because 1855278241 - 2¹¹ = 1855276193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1855278251) 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, 2093551 + ... + 2094436.

It is an arithmetic number, because the mean of its divisors is an integer number (464866668).

Almost surely, 2^1855278241 is an apocalyptic number.

It is an amenable number.

1855278241 is a deficient number, since it is larger than the sum of its proper divisors (4188431).

1855278241 is an equidigital number, since it uses as much as digits as its factorization.

1855278241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4188430.

The product of its digits is 179200, while the sum is 43.

The square root of 1855278241 is about 43072.9409374377. The cubic root of 1855278241 is about 1228.7674084479.

The spelling of 1855278241 in words is "one billion, eight hundred fifty-five million, two hundred seventy-eight thousand, two hundred forty-one".