1820382830281 has 4 divisors (see below), whose sum is σ = 1822787563972. Its totient is φ = 1817978096592.

The previous prime is 1820382830267. The next prime is 1820382830291.

1820382830281 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 470789471881 + 1349593358400 = 686141^2 + 1161720^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820382830281 - 2⁷ = 1820382830153 is a prime.

It is a super-2 number, since 2×1820382830281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1820382830221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1202365710 + ... + 1202367223.

It is an arithmetic number, because the mean of its divisors is an integer number (455696890993).

Almost surely, 2^{1820382830281} is an apocalyptic number.

It is an amenable number.

1820382830281 is a deficient number, since it is larger than the sum of its proper divisors (2404733691).

1820382830281 is an equidigital number, since it uses as much as digits as its factorization.

1820382830281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404733690.

The product of its (nonzero) digits is 294912, while the sum is 46.

The spelling of 1820382830281 in words is "one trillion, eight hundred twenty billion, three hundred eighty-two million, eight hundred thirty thousand, two hundred eighty-one".