30013561 has 2 divisors, whose sum is σ = 30013562. Its totient is φ = 30013560.

The previous prime is 30013553. The next prime is 30013573. The reversal of 30013561 is 16531003.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26327161 + 3686400 = 5131^2 + 1920^2 .

It is a cyclic number.

It is not a de Polignac number, because 30013561 - 2³ = 30013553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30013861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15006780 + 15006781.

It is an arithmetic number, because the mean of its divisors is an integer number (15006781).

Almost surely, 2^30013561 is an apocalyptic number.

It is an amenable number.

30013561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30013561 is an equidigital number, since it uses as much as digits as its factorization.

30013561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 30013561 is about 5478.4633794523. The cubic root of 30013561 is about 310.7700626315.

Adding to 30013561 its reverse (16531003), we get a palindrome (46544564).

It can be divided in two parts, 300 and 13561, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 30013561 in words is "thirty million, thirteen thousand, five hundred sixty-one".