61145563 has 2 divisors, whose sum is σ = 61145564. Its totient is φ = 61145562.

The previous prime is 61145561. The next prime is 61145587. The reversal of 61145563 is 36554116.

61145563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61145563 - 2¹ = 61145561 is a prime.

Together with 61145561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61145561) 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, 30572781 + 30572782.

It is an arithmetic number, because the mean of its divisors is an integer number (30572782).

Almost surely, 2^61145563 is an apocalyptic number.

61145563 is a deficient number, since it is larger than the sum of its proper divisors (1).

61145563 is an equidigital number, since it uses as much as digits as its factorization.

61145563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 61145563 is about 7819.5628394431. The cubic root of 61145563 is about 393.9625888877.

Adding to 61145563 its reverse (36554116), we get a palindrome (97699679).

The spelling of 61145563 in words is "sixty-one million, one hundred forty-five thousand, five hundred sixty-three".