1812802681 has 2 divisors, whose sum is σ = 1812802682. Its totient is φ = 1812802680.

The previous prime is 1812802657. The next prime is 1812802687. The reversal of 1812802681 is 1862082181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1767361600 + 45441081 = 42040^2 + 6741^2 .

It is an emirp because it is prime and its reverse (1862082181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1812802681 - 2⁹ = 1812802169 is a prime.

It is a super-2 number, since 2×1812802681² = 6572507120481575522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1812802681.

It is not a weakly prime, because it can be changed into another prime (1812802687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906401340 + 906401341.

It is an arithmetic number, because the mean of its divisors is an integer number (906401341).

Almost surely, 2^1812802681 is an apocalyptic number.

It is an amenable number.

1812802681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812802681 is an equidigital number, since it uses as much as digits as its factorization.

1812802681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 1812802681 is about 42577.0205744836. The cubic root of 1812802681 is about 1219.3176066020.

The spelling of 1812802681 in words is "one billion, eight hundred twelve million, eight hundred two thousand, six hundred eighty-one".