1051806131821 has 2 divisors, whose sum is σ = 1051806131822. Its totient is φ = 1051806131820.

The previous prime is 1051806131773. The next prime is 1051806131863. The reversal of 1051806131821 is 1281316081501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 838533961225 + 213272170596 = 915715^2 + 461814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051806131821 - 2²⁷ = 1051671914093 is a prime.

It is a super-2 number, since 2×1051806131821² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1051806131881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525903065910 + 525903065911.

It is an arithmetic number, because the mean of its divisors is an integer number (525903065911).

Almost surely, 2^{1051806131821} is an apocalyptic number.

It is an amenable number.

1051806131821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051806131821 is an equidigital number, since it uses as much as digits as its factorization.

1051806131821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 37.

The spelling of 1051806131821 in words is "one trillion, fifty-one billion, eight hundred six million, one hundred thirty-one thousand, eight hundred twenty-one".