61729589 has 2 divisors, whose sum is σ = 61729590. Its totient is φ = 61729588.

The previous prime is 61729571. The next prime is 61729607. The reversal of 61729589 is 98592716.

It is a balanced prime because it is at equal distance from previous prime (61729571) and next prime (61729607).

It can be written as a sum of positive squares in only one way, i.e., 61105489 + 624100 = 7817^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 61729589 - 2⁸ = 61729333 is a prime.

It is a Sophie Germain 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 (61729529) 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, 30864794 + 30864795.

It is an arithmetic number, because the mean of its divisors is an integer number (30864795).

Almost surely, 2^61729589 is an apocalyptic number.

It is an amenable number.

61729589 is a deficient number, since it is larger than the sum of its proper divisors (1).

61729589 is an equidigital number, since it uses as much as digits as its factorization.

61729589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 61729589 is about 7856.8179945828. The cubic root of 61729589 is about 395.2129151758.

The spelling of 61729589 in words is "sixty-one million, seven hundred twenty-nine thousand, five hundred eighty-nine".