30502561 has 2 divisors, whose sum is σ = 30502562. Its totient is φ = 30502560.

The previous prime is 30502499. The next prime is 30502567. The reversal of 30502561 is 16520503.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26625600 + 3876961 = 5160^2 + 1969^2 .

It is an emirp because it is prime and its reverse (16520503) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30502561 - 2²¹ = 28405409 is a prime.

It is not a weakly prime, because it can be changed into another prime (30502567) 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, 15251280 + 15251281.

It is an arithmetic number, because the mean of its divisors is an integer number (15251281).

Almost surely, 2^30502561 is an apocalyptic number.

It is an amenable number.

30502561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30502561 is an equidigital number, since it uses as much as digits as its factorization.

30502561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 30502561 is about 5522.9123657722. The cubic root of 30502561 is about 312.4487331366.

The spelling of 30502561 in words is "thirty million, five hundred two thousand, five hundred sixty-one".