3621820849 has 2 divisors, whose sum is σ = 3621820850. Its totient is φ = 3621820848.

The previous prime is 3621820847. The next prime is 3621820897. The reversal of 3621820849 is 9480281263.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3224536225 + 397284624 = 56785^2 + 19932^2 .

It is a cyclic number.

It is not a de Polignac number, because 3621820849 - 2¹ = 3621820847 is a prime.

Together with 3621820847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3621820841) 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 as a sum of consecutive naturals, namely, 1810910424 + 1810910425.

It is an arithmetic number, because the mean of its divisors is an integer number (1810910425).

Almost surely, 2^3621820849 is an apocalyptic number.

It is an amenable number.

3621820849 is a deficient number, since it is larger than the sum of its proper divisors (1).

3621820849 is an equidigital number, since it uses as much as digits as its factorization.

3621820849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 3621820849 is about 60181.5656908326. The cubic root of 3621820849 is about 1535.7092075165.

The spelling of 3621820849 in words is "three billion, six hundred twenty-one million, eight hundred twenty thousand, eight hundred forty-nine".