1845171049 has 2 divisors, whose sum is σ = 1845171050. Its totient is φ = 1845171048.

The previous prime is 1845171047. The next prime is 1845171077. The reversal of 1845171049 is 9401715481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1400256400 + 444914649 = 37420^2 + 21093^2 .

It is an emirp because it is prime and its reverse (9401715481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1845171049 - 2¹ = 1845171047 is a prime.

Together with 1845171047, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1845171043) 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, 922585524 + 922585525.

It is an arithmetic number, because the mean of its divisors is an integer number (922585525).

Almost surely, 2^1845171049 is an apocalyptic number.

It is an amenable number.

1845171049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1845171049 is an equidigital number, since it uses as much as digits as its factorization.

1845171049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 1845171049 is about 42955.4542404105. The cubic root of 1845171049 is about 1226.5319828481.

The spelling of 1845171049 in words is "one billion, eight hundred forty-five million, one hundred seventy-one thousand, forty-nine".