61159729 has 2 divisors, whose sum is σ = 61159730. Its totient is φ = 61159728.

The previous prime is 61159723. The next prime is 61159789. The reversal of 61159729 is 92795116.

61159729 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 can be written as a sum of positive squares in only one way, i.e., 37540129 + 23619600 = 6127^2 + 4860^2 .

It is a cyclic number.

It is not a de Polignac number, because 61159729 - 2⁷ = 61159601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61159691 and 61159700.

It is not a weakly prime, because it can be changed into another prime (61159723) 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, 30579864 + 30579865.

It is an arithmetic number, because the mean of its divisors is an integer number (30579865).

Almost surely, 2^61159729 is an apocalyptic number.

It is an amenable number.

61159729 is a deficient number, since it is larger than the sum of its proper divisors (1).

61159729 is an equidigital number, since it uses as much as digits as its factorization.

61159729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 40.

The square root of 61159729 is about 7820.4685920986. The cubic root of 61159729 is about 393.9930105179.

The spelling of 61159729 in words is "sixty-one million, one hundred fifty-nine thousand, seven hundred twenty-nine".