7036581821 has 2 divisors, whose sum is σ = 7036581822. Its totient is φ = 7036581820.

The previous prime is 7036581787. The next prime is 7036581833. The reversal of 7036581821 is 1281856307.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7003346596 + 33235225 = 83686^2 + 5765^2 .

It is a cyclic number.

It is not a de Polignac number, because 7036581821 - 2⁶ = 7036581757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7036581121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3518290910 + 3518290911.

It is an arithmetic number, because the mean of its divisors is an integer number (3518290911).

Almost surely, 2^7036581821 is an apocalyptic number.

It is an amenable number.

7036581821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7036581821 is an equidigital number, since it uses as much as digits as its factorization.

7036581821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 7036581821 is about 83884.3359692380. The cubic root of 7036581821 is about 1916.2577045269.

The spelling of 7036581821 in words is "seven billion, thirty-six million, five hundred eighty-one thousand, eight hundred twenty-one".