61678109 has 2 divisors, whose sum is σ = 61678110. Its totient is φ = 61678108.

The previous prime is 61678087. The next prime is 61678163. The reversal of 61678109 is 90187616.

61678109 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., 60684100 + 994009 = 7790^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 61678109 - 2¹² = 61674013 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61671109) 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, 30839054 + 30839055.

It is an arithmetic number, because the mean of its divisors is an integer number (30839055).

Almost surely, 2^61678109 is an apocalyptic number.

It is an amenable number.

61678109 is a deficient number, since it is larger than the sum of its proper divisors (1).

61678109 is an equidigital number, since it uses as much as digits as its factorization.

61678109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 61678109 is about 7853.5411758009. The cubic root of 61678109 is about 395.1030207172.

The spelling of 61678109 in words is "sixty-one million, six hundred seventy-eight thousand, one hundred nine".