30541561 has 2 divisors, whose sum is σ = 30541562. Its totient is φ = 30541560.

The previous prime is 30541559. The next prime is 30541579. The reversal of 30541561 is 16514503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 5089536 = 5045^2 + 2256^2 .

It is a cyclic number.

It is not a de Polignac number, because 30541561 - 2¹ = 30541559 is a prime.

Together with 30541559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30541661) 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, 15270780 + 15270781.

It is an arithmetic number, because the mean of its divisors is an integer number (15270781).

Almost surely, 2^30541561 is an apocalyptic number.

30541561 is the 2472-nd centered decagonal number.

It is an amenable number.

30541561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30541561 is an equidigital number, since it uses as much as digits as its factorization.

30541561 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 30541561 is about 5526.4419837722. The cubic root of 30541561 is about 312.5818401118.

The spelling of 30541561 in words is "thirty million, five hundred forty-one thousand, five hundred sixty-one".