61908689 has 2 divisors, whose sum is σ = 61908690. Its totient is φ = 61908688.

The previous prime is 61908677. The next prime is 61908703. The reversal of 61908689 is 98680916.

61908689 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., 57532225 + 4376464 = 7585^2 + 2092^2 .

It is a cyclic number.

It is not a de Polignac number, because 61908689 - 2⁴ = 61908673 is a prime.

It is not a weakly prime, because it can be changed into another prime (61908619) 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, 30954344 + 30954345.

It is an arithmetic number, because the mean of its divisors is an integer number (30954345).

Almost surely, 2^61908689 is an apocalyptic number.

It is an amenable number.

61908689 is a deficient number, since it is larger than the sum of its proper divisors (1).

61908689 is an equidigital number, since it uses as much as digits as its factorization.

61908689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 61908689 is about 7868.2074832836. The cubic root of 61908689 is about 395.5947649445.

The spelling of 61908689 in words is "sixty-one million, nine hundred eight thousand, six hundred eighty-nine".