61561061 has 2 divisors, whose sum is σ = 61561062. Its totient is φ = 61561060.

The previous prime is 61561051. The next prime is 61561069. The reversal of 61561061 is 16016516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47348161 + 14212900 = 6881^2 + 3770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61561061 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61561061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61561069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30780530 + 30780531.

It is an arithmetic number, because the mean of its divisors is an integer number (30780531).

Almost surely, 2^61561061 is an apocalyptic number.

It is an amenable number.

61561061 is a deficient number, since it is larger than the sum of its proper divisors (1).

61561061 is an equidigital number, since it uses as much as digits as its factorization.

61561061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 61561061 is about 7846.0857119968. The cubic root of 61561061 is about 394.8529303472.

Adding to 61561061 its reverse (16016516), we get a palindrome (77577577).

The spelling of 61561061 in words is "sixty-one million, five hundred sixty-one thousand, sixty-one".