61885139 has 2 divisors, whose sum is σ = 61885140. Its totient is φ = 61885138.

The previous prime is 61885129. The next prime is 61885169. The reversal of 61885139 is 93158816.

61885139 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 is a cyclic number.

It is not a de Polignac number, because 61885139 - 2⁴ = 61885123 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61885096 and 61885105.

It is not a weakly prime, because it can be changed into another prime (61885129) 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, 30942569 + 30942570.

It is an arithmetic number, because the mean of its divisors is an integer number (30942570).

Almost surely, 2^61885139 is an apocalyptic number.

61885139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61885139 is an equidigital number, since it uses as much as digits as its factorization.

61885139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 41.

The square root of 61885139 is about 7866.7108120230. The cubic root of 61885139 is about 395.5445973056.

The spelling of 61885139 in words is "sixty-one million, eight hundred eighty-five thousand, one hundred thirty-nine".