1811280049 has 2 divisors, whose sum is σ = 1811280050. Its totient is φ = 1811280048.

The previous prime is 1811280043. The next prime is 1811280091. The reversal of 1811280049 is 9400821181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1745150625 + 66129424 = 41775^2 + 8132^2 .

It is a cyclic number.

It is not a de Polignac number, because 1811280049 - 2⁵ = 1811280017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1811279996 and 1811280023.

It is not a weakly prime, because it can be changed into another prime (1811280043) 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, 905640024 + 905640025.

It is an arithmetic number, because the mean of its divisors is an integer number (905640025).

Almost surely, 2^1811280049 is an apocalyptic number.

It is an amenable number.

1811280049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811280049 is an equidigital number, since it uses as much as digits as its factorization.

1811280049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 1811280049 is about 42559.1359052319. The cubic root of 1811280049 is about 1218.9761294579.

The spelling of 1811280049 in words is "one billion, eight hundred eleven million, two hundred eighty thousand, forty-nine".