61739609 has 2 divisors, whose sum is σ = 61739610. Its totient is φ = 61739608.

The previous prime is 61739593. The next prime is 61739617. The reversal of 61739609 is 90693716.

It is a happy number.

61739609 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 can be written as a sum of positive squares in only one way, i.e., 58186384 + 3553225 = 7628^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 61739609 - 2⁴ = 61739593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61730609) 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, 30869804 + 30869805.

It is an arithmetic number, because the mean of its divisors is an integer number (30869805).

Almost surely, 2^61739609 is an apocalyptic number.

It is an amenable number.

61739609 is a deficient number, since it is larger than the sum of its proper divisors (1).

61739609 is an equidigital number, since it uses as much as digits as its factorization.

61739609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 61739609 is about 7857.4556314369. The cubic root of 61739609 is about 395.2342977857.

The spelling of 61739609 in words is "sixty-one million, seven hundred thirty-nine thousand, six hundred nine".