30280561 has 2 divisors, whose sum is σ = 30280562. Its totient is φ = 30280560.

The previous prime is 30280531. The next prime is 30280589. The reversal of 30280561 is 16508203.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15649936 + 14630625 = 3956^2 + 3825^2 .

It is an emirp because it is prime and its reverse (16508203) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30280561 - 2⁵ = 30280529 is a prime.

It is not a weakly prime, because it can be changed into another prime (30280531) 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, 15140280 + 15140281.

It is an arithmetic number, because the mean of its divisors is an integer number (15140281).

Almost surely, 2^30280561 is an apocalyptic number.

It is an amenable number.

30280561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30280561 is an equidigital number, since it uses as much as digits as its factorization.

30280561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 30280561 is about 5502.7775713725. Note that the first 3 decimals coincide. The cubic root of 30280561 is about 311.6888780279.

Adding to 30280561 its reverse (16508203), we get a palindrome (46788764).

The spelling of 30280561 in words is "thirty million, two hundred eighty thousand, five hundred sixty-one".