61889189 has 2 divisors, whose sum is σ = 61889190. Its totient is φ = 61889188.

The previous prime is 61889147. The next prime is 61889207. The reversal of 61889189 is 98198816.

It is a happy number.

61889189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47128225 + 14760964 = 6865^2 + 3842^2 .

It is a cyclic number.

It is not a de Polignac number, because 61889189 - 2⁸ = 61888933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61889119) 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, 30944594 + 30944595.

It is an arithmetic number, because the mean of its divisors is an integer number (30944595).

Almost surely, 2^61889189 is an apocalyptic number.

It is an amenable number.

61889189 is a deficient number, since it is larger than the sum of its proper divisors (1).

61889189 is an equidigital number, since it uses as much as digits as its factorization.

61889189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 50.

The square root of 61889189 is about 7866.9682216213. The cubic root of 61889189 is about 395.5532257674.

The spelling of 61889189 in words is "sixty-one million, eight hundred eighty-nine thousand, one hundred eighty-nine".