1620684041 has 2 divisors, whose sum is σ = 1620684042. Its totient is φ = 1620684040.

The previous prime is 1620684031. The next prime is 1620684083. The reversal of 1620684041 is 1404860261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 864654025 + 756030016 = 29405^2 + 27496^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620684041 - 2³⁰ = 546942217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1620683989 and 1620684007.

It is not a weakly prime, because it can be changed into another prime (1620684011) 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, 810342020 + 810342021.

It is an arithmetic number, because the mean of its divisors is an integer number (810342021).

Almost surely, 2^1620684041 is an apocalyptic number.

It is an amenable number.

1620684041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620684041 is an equidigital number, since it uses as much as digits as its factorization.

1620684041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1620684041 is about 40257.7202658074. The cubic root of 1620684041 is about 1174.6255734092.

The spelling of 1620684041 in words is "one billion, six hundred twenty million, six hundred eighty-four thousand, forty-one".