30561745 has 4 divisors (see below), whose sum is σ = 36674100. Its totient is φ = 24449392.

The previous prime is 30561731. The next prime is 30561749. The reversal of 30561745 is 54716503.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23357889 + 7203856 = 4833^2 + 2684^2 .

It is a cyclic number.

It is not a de Polignac number, because 30561745 - 2⁷ = 30561617 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (30561749) 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 in 3 ways as a sum of consecutive naturals, for example, 3056170 + ... + 3056179.

It is an arithmetic number, because the mean of its divisors is an integer number (9168525).

Almost surely, 2^30561745 is an apocalyptic number.

It is an amenable number.

30561745 is a deficient number, since it is larger than the sum of its proper divisors (6112355).

30561745 is an equidigital number, since it uses as much as digits as its factorization.

30561745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6112354.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 30561745 is about 5528.2678118919. The cubic root of 30561745 is about 312.6506835972.

The spelling of 30561745 in words is "thirty million, five hundred sixty-one thousand, seven hundred forty-five".