30145561 has 2 divisors, whose sum is σ = 30145562. Its totient is φ = 30145560.

The previous prime is 30145483. The next prime is 30145567. The reversal of 30145561 is 16554103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24651225 + 5494336 = 4965^2 + 2344^2 .

It is an emirp because it is prime and its reverse (16554103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30145561 - 2¹⁵ = 30112793 is a prime.

It is not a weakly prime, because it can be changed into another prime (30145567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15072780 + 15072781.

It is an arithmetic number, because the mean of its divisors is an integer number (15072781).

Almost surely, 2^30145561 is an apocalyptic number.

It is an amenable number.

30145561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30145561 is an equidigital number, since it uses as much as digits as its factorization.

30145561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 30145561 is about 5490.4973363075. The cubic root of 30145561 is about 311.2249865115.

Adding to 30145561 its reverse (16554103), we get a palindrome (46699664).

The spelling of 30145561 in words is "thirty million, one hundred forty-five thousand, five hundred sixty-one".