30724289 has 2 divisors, whose sum is σ = 30724290. Its totient is φ = 30724288.

The previous prime is 30724277. The next prime is 30724333. The reversal of 30724289 is 98242703.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30030400 + 693889 = 5480^2 + 833^2 .

It is a cyclic number.

It is not a de Polignac number, because 30724289 - 2¹⁶ = 30658753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30724189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15362144 + 15362145.

It is an arithmetic number, because the mean of its divisors is an integer number (15362145).

Almost surely, 2^30724289 is an apocalyptic number.

It is an amenable number.

30724289 is a deficient number, since it is larger than the sum of its proper divisors (1).

30724289 is an equidigital number, since it uses as much as digits as its factorization.

30724289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 30724289 is about 5542.9494856078. The cubic root of 30724289 is about 313.2039860209.

It can be divided in two parts, 30724 and 289, that added together give a palindrome (31013).

The spelling of 30724289 in words is "thirty million, seven hundred twenty-four thousand, two hundred eighty-nine".