61439789 has 2 divisors, whose sum is σ = 61439790. Its totient is φ = 61439788.

The previous prime is 61439761. The next prime is 61439797. The reversal of 61439789 is 98793416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58782889 + 2656900 = 7667^2 + 1630^2 .

It is a cyclic number.

It is not a de Polignac number, because 61439789 - 2⁸ = 61439533 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61439759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30719894 + 30719895.

It is an arithmetic number, because the mean of its divisors is an integer number (30719895).

Almost surely, 2^61439789 is an apocalyptic number.

It is an amenable number.

61439789 is a deficient number, since it is larger than the sum of its proper divisors (1).

61439789 is an equidigital number, since it uses as much as digits as its factorization.

61439789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 61439789 is about 7838.3537174588. The cubic root of 61439789 is about 394.5934801816.

The spelling of 61439789 in words is "sixty-one million, four hundred thirty-nine thousand, seven hundred eighty-nine".