1812464981 has 2 divisors, whose sum is σ = 1812464982. Its totient is φ = 1812464980.

The previous prime is 1812464963. The next prime is 1812464987. The reversal of 1812464981 is 1894642181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1811864356 + 600625 = 42566^2 + 775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812464981 - 2⁶ = 1812464917 is a prime.

It is a super-2 number, since 2×1812464981² = 6570058614702660722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1812464987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906232490 + 906232491.

It is an arithmetic number, because the mean of its divisors is an integer number (906232491).

Almost surely, 2^1812464981 is an apocalyptic number.

It is an amenable number.

1812464981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812464981 is an equidigital number, since it uses as much as digits as its factorization.

1812464981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 44.

The square root of 1812464981 is about 42573.0546355321. The cubic root of 1812464981 is about 1219.2418879131.

The spelling of 1812464981 in words is "one billion, eight hundred twelve million, four hundred sixty-four thousand, nine hundred eighty-one".