61019561 has 2 divisors, whose sum is σ = 61019562. Its totient is φ = 61019560.

The previous prime is 61019551. The next prime is 61019587. The reversal of 61019561 is 16591016.

61019561 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 can be written as a sum of positive squares in only one way, i.e., 58675600 + 2343961 = 7660^2 + 1531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61019561 is a prime.

It is not a weakly prime, because it can be changed into another prime (61019551) 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, 30509780 + 30509781.

It is an arithmetic number, because the mean of its divisors is an integer number (30509781).

Almost surely, 2^61019561 is an apocalyptic number.

It is an amenable number.

61019561 is a deficient number, since it is larger than the sum of its proper divisors (1).

61019561 is an equidigital number, since it uses as much as digits as its factorization.

61019561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 61019561 is about 7811.5018402353. The cubic root of 61019561 is about 393.6917913114.

The spelling of 61019561 in words is "sixty-one million, nineteen thousand, five hundred sixty-one".