61965139 has 2 divisors, whose sum is σ = 61965140. Its totient is φ = 61965138.

The previous prime is 61965097. The next prime is 61965181. The reversal of 61965139 is 93156916.

61965139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (61965097) and next prime (61965181).

It is a cyclic number.

It is not a de Polignac number, because 61965139 - 2⁷ = 61965011 is a prime.

It is not a weakly prime, because it can be changed into another prime (61965439) 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, 30982569 + 30982570.

It is an arithmetic number, because the mean of its divisors is an integer number (30982570).

Almost surely, 2^61965139 is an apocalyptic number.

61965139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61965139 is an equidigital number, since it uses as much as digits as its factorization.

61965139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 40.

The square root of 61965139 is about 7871.7938870374. The cubic root of 61965139 is about 395.7149663833.

The spelling of 61965139 in words is "sixty-one million, nine hundred sixty-five thousand, one hundred thirty-nine".