1810802881 has 4 divisors (see below), whose sum is σ = 1810902100. Its totient is φ = 1810703664.

The previous prime is 1810802867. The next prime is 1810802893. The reversal of 1810802881 is 1882080181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1394275600 + 416527281 = 37340^2 + 20409^2 .

It is a cyclic number.

It is not a de Polignac number, because 1810802881 - 2⁵ = 1810802849 is a prime.

It is a super-2 number, since 2×1810802881² = 6558014147675800322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1810802881.

It is not an unprimeable number, because it can be changed into a prime (1810802831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13446 + ... + 61663.

It is an arithmetic number, because the mean of its divisors is an integer number (452725525).

Almost surely, 2^1810802881 is an apocalyptic number.

It is an amenable number.

1810802881 is a deficient number, since it is larger than the sum of its proper divisors (99219).

1810802881 is an equidigital number, since it uses as much as digits as its factorization.

1810802881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99218.

The product of its (nonzero) digits is 8192, while the sum is 37.

The square root of 1810802881 is about 42553.5295950876. The cubic root of 1810802881 is about 1218.8690767160.

The spelling of 1810802881 in words is "one billion, eight hundred ten million, eight hundred two thousand, eight hundred eighty-one".