30247561 has 2 divisors, whose sum is σ = 30247562. Its totient is φ = 30247560.

The previous prime is 30247531. The next prime is 30247571. The reversal of 30247561 is 16574203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26327161 + 3920400 = 5131^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 30247561 - 2⁷ = 30247433 is a prime.

It is not a weakly prime, because it can be changed into another prime (30247531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15123780 + 15123781.

It is an arithmetic number, because the mean of its divisors is an integer number (15123781).

Almost surely, 2^30247561 is an apocalyptic number.

It is an amenable number.

30247561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30247561 is an equidigital number, since it uses as much as digits as its factorization.

30247561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 30247561 is about 5499.7782682577. The cubic root of 30247561 is about 311.5756098520.

It can be divided in two parts, 3024 and 7561, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 30247561 in words is "thirty million, two hundred forty-seven thousand, five hundred sixty-one".