61401139 has 2 divisors, whose sum is σ = 61401140. Its totient is φ = 61401138.

The previous prime is 61401121. The next prime is 61401143. The reversal of 61401139 is 93110416.

61401139 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 is a cyclic number.

It is not a de Polignac number, because 61401139 - 2¹⁵ = 61368371 is a prime.

It is not a weakly prime, because it can be changed into another prime (61401169) 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, 30700569 + 30700570.

It is an arithmetic number, because the mean of its divisors is an integer number (30700570).

Almost surely, 2^61401139 is an apocalyptic number.

61401139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61401139 is an equidigital number, since it uses as much as digits as its factorization.

61401139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 61401139 is about 7835.8878884272. The cubic root of 61401139 is about 394.5107203644.

The spelling of 61401139 in words is "sixty-one million, four hundred one thousand, one hundred thirty-nine".