30236561 has 2 divisors, whose sum is σ = 30236562. Its totient is φ = 30236560.

The previous prime is 30236551. The next prime is 30236567. The reversal of 30236561 is 16563203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16248961 + 13987600 = 4031^2 + 3740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30236561 is a prime.

It is a super-2 number, since 2×30236561² = 1828499242213442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30236561.

It is not a weakly prime, because it can be changed into another prime (30236567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15118280 + 15118281.

It is an arithmetic number, because the mean of its divisors is an integer number (15118281).

Almost surely, 2^30236561 is an apocalyptic number.

It is an amenable number.

30236561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30236561 is an equidigital number, since it uses as much as digits as its factorization.

30236561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 30236561 is about 5498.7781370046. The cubic root of 30236561 is about 311.5378354866.

Adding to 30236561 its reverse (16563203), we get a palindrome (46799764).

It can be divided in two parts, 302 and 36561, that added together give a palindrome (36863).

The spelling of 30236561 in words is "thirty million, two hundred thirty-six thousand, five hundred sixty-one".