409721089 has 2 divisors, whose sum is σ = 409721090. Its totient is φ = 409721088.

The previous prime is 409721047. The next prime is 409721093. The reversal of 409721089 is 980127904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235929600 + 173791489 = 15360^2 + 13183^2 .

It is a cyclic number.

It is not a de Polignac number, because 409721089 - 2¹⁷ = 409590017 is a prime.

It is not a weakly prime, because it can be changed into another prime (409721789) 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, 204860544 + 204860545.

It is an arithmetic number, because the mean of its divisors is an integer number (204860545).

Almost surely, 2^409721089 is an apocalyptic number.

It is an amenable number.

409721089 is a deficient number, since it is larger than the sum of its proper divisors (1).

409721089 is an equidigital number, since it uses as much as digits as its factorization.

409721089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 409721089 is about 20241.5683433868. The cubic root of 409721089 is about 742.7273891559.

The spelling of 409721089 in words is "four hundred nine million, seven hundred twenty-one thousand, eighty-nine".