1620201647 has 2 divisors, whose sum is σ = 1620201648. Its totient is φ = 1620201646.

The previous prime is 1620201623. The next prime is 1620201703. The reversal of 1620201647 is 7461020261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620201647 - 2¹⁴ = 1620185263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620201607) 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, 810100823 + 810100824.

It is an arithmetic number, because the mean of its divisors is an integer number (810100824).

Almost surely, 2^1620201647 is an apocalyptic number.

1620201647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620201647 is an equidigital number, since it uses as much as digits as its factorization.

1620201647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1620201647 is about 40251.7284970472. The cubic root of 1620201647 is about 1174.5090200398.

The spelling of 1620201647 in words is "one billion, six hundred twenty million, two hundred one thousand, six hundred forty-seven".