1621284089 has 2 divisors, whose sum is σ = 1621284090. Its totient is φ = 1621284088.

The previous prime is 1621284073. The next prime is 1621284109. The reversal of 1621284089 is 9804821261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1400256400 + 221027689 = 37420^2 + 14867^2 .

It is an emirp because it is prime and its reverse (9804821261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1621284089 - 2⁴ = 1621284073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1621284059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810642044 + 810642045.

It is an arithmetic number, because the mean of its divisors is an integer number (810642045).

Almost surely, 2^1621284089 is an apocalyptic number.

It is an amenable number.

1621284089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621284089 is an equidigital number, since it uses as much as digits as its factorization.

1621284089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 1621284089 is about 40265.1721590756. The cubic root of 1621284089 is about 1174.7705214146.

The spelling of 1621284089 in words is "one billion, six hundred twenty-one million, two hundred eighty-four thousand, eighty-nine".