1855793081 has 2 divisors, whose sum is σ = 1855793082. Its totient is φ = 1855793080.

The previous prime is 1855793047. The next prime is 1855793141. The reversal of 1855793081 is 1803975581.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1513210000 + 342583081 = 38900^2 + 18509^2 .

It is an emirp because it is prime and its reverse (1803975581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1855793081 is a prime.

It is a super-2 number, since 2×1855793081² = 6887935918974945122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1855793281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927896540 + 927896541.

It is an arithmetic number, because the mean of its divisors is an integer number (927896541).

Almost surely, 2^1855793081 is an apocalyptic number.

It is an amenable number.

1855793081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855793081 is an equidigital number, since it uses as much as digits as its factorization.

1855793081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 47.

The square root of 1855793081 is about 43078.9168967837. The cubic root of 1855793081 is about 1228.8810589847.

The spelling of 1855793081 in words is "one billion, eight hundred fifty-five million, seven hundred ninety-three thousand, eighty-one".