30047561 has 2 divisors, whose sum is σ = 30047562. Its totient is φ = 30047560.

The previous prime is 30047539. The next prime is 30047573. The reversal of 30047561 is 16574003.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30030400 + 17161 = 5480^2 + 131^2 .

It is a cyclic number.

It is not a de Polignac number, because 30047561 - 2¹⁰ = 30046537 is a prime.

It is equal to p_1860650 and since 30047561 and 1860650 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30047561.

It is not a weakly prime, because it can be changed into another prime (30047581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15023780 + 15023781.

It is an arithmetic number, because the mean of its divisors is an integer number (15023781).

Almost surely, 2^30047561 is an apocalyptic number.

It is an amenable number.

30047561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30047561 is an equidigital number, since it uses as much as digits as its factorization.

30047561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 30047561 is about 5481.5655610418. The cubic root of 30047561 is about 310.8873673255.

The spelling of 30047561 in words is "thirty million, forty-seven thousand, five hundred sixty-one".