61553161 has 2 divisors, whose sum is σ = 61553162. Its totient is φ = 61553160.

The previous prime is 61553153. The next prime is 61553183. The reversal of 61553161 is 16135516.

61553161 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., 46498761 + 15054400 = 6819^2 + 3880^2 .

It is a cyclic number.

It is not a de Polignac number, because 61553161 - 2³ = 61553153 is a prime.

It is not a weakly prime, because it can be changed into another prime (61553111) 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, 30776580 + 30776581.

It is an arithmetic number, because the mean of its divisors is an integer number (30776581).

Almost surely, 2^61553161 is an apocalyptic number.

It is an amenable number.

61553161 is a deficient number, since it is larger than the sum of its proper divisors (1).

61553161 is an equidigital number, since it uses as much as digits as its factorization.

61553161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 28.

The square root of 61553161 is about 7845.5822601003. The cubic root of 61553161 is about 394.8360394124.

Adding to 61553161 its reverse (16135516), we get a palindrome (77688677).

It can be divided in two parts, 6155 and 3161, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 61553161 in words is "sixty-one million, five hundred fifty-three thousand, one hundred sixty-one".