1620221041 has 2 divisors, whose sum is σ = 1620221042. Its totient is φ = 1620221040.

The previous prime is 1620221027. The next prime is 1620221063. The reversal of 1620221041 is 1401220261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1008697600 + 611523441 = 31760^2 + 24729^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620221041 - 2⁹ = 1620220529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1620221011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810110520 + 810110521.

It is an arithmetic number, because the mean of its divisors is an integer number (810110521).

Almost surely, 2^1620221041 is an apocalyptic number.

It is an amenable number.

1620221041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620221041 is an equidigital number, since it uses as much as digits as its factorization.

1620221041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1620221041 is about 40251.9694052353. The cubic root of 1620221041 is about 1174.5137063571.

The spelling of 1620221041 in words is "one billion, six hundred twenty million, two hundred twenty-one thousand, forty-one".