30561493 has 2 divisors, whose sum is σ = 30561494. Its totient is φ = 30561492.

The previous prime is 30561491. The next prime is 30561521. The reversal of 30561493 is 39416503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18679684 + 11881809 = 4322^2 + 3447^2 .

It is a cyclic number.

It is not a de Polignac number, because 30561493 - 2¹ = 30561491 is a prime.

Together with 30561491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30561491) 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, 15280746 + 15280747.

It is an arithmetic number, because the mean of its divisors is an integer number (15280747).

Almost surely, 2^30561493 is an apocalyptic number.

It is an amenable number.

30561493 is a deficient number, since it is larger than the sum of its proper divisors (1).

30561493 is an equidigital number, since it uses as much as digits as its factorization.

30561493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 30561493 is about 5528.2450198956. The cubic root of 30561493 is about 312.6498242638.

Adding to 30561493 its reverse (39416503), we get a palindrome (69977996).

The spelling of 30561493 in words is "thirty million, five hundred sixty-one thousand, four hundred ninety-three".