1641103621 has 2 divisors, whose sum is σ = 1641103622. Its totient is φ = 1641103620.

The previous prime is 1641103601. The next prime is 1641103669. The reversal of 1641103621 is 1263011461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000456900 + 640646721 = 31630^2 + 25311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641103621 - 2⁵ = 1641103589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641103601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820551810 + 820551811.

It is an arithmetic number, because the mean of its divisors is an integer number (820551811).

Almost surely, 2^1641103621 is an apocalyptic number.

It is an amenable number.

1641103621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641103621 is an equidigital number, since it uses as much as digits as its factorization.

1641103621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1641103621 is about 40510.5371601019. The cubic root of 1641103621 is about 1179.5381753520.

The spelling of 1641103621 in words is "one billion, six hundred forty-one million, one hundred three thousand, six hundred twenty-one".