1811473649 has 2 divisors, whose sum is σ = 1811473650. Its totient is φ = 1811473648.

The previous prime is 1811473627. The next prime is 1811473667. The reversal of 1811473649 is 9463741181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1138590049 + 672883600 = 33743^2 + 25940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1811473649 - 2¹⁶ = 1811408113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1811473619) 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, 905736824 + 905736825.

It is an arithmetic number, because the mean of its divisors is an integer number (905736825).

Almost surely, 2^1811473649 is an apocalyptic number.

It is an amenable number.

1811473649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811473649 is an equidigital number, since it uses as much as digits as its factorization.

1811473649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 1811473649 is about 42561.4103267267. The cubic root of 1811473649 is about 1219.0195582973.

The spelling of 1811473649 in words is "one billion, eight hundred eleven million, four hundred seventy-three thousand, six hundred forty-nine".