61730309 has 2 divisors, whose sum is σ = 61730310. Its totient is φ = 61730308.

The previous prime is 61730303. The next prime is 61730323. The reversal of 61730309 is 90303716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46104100 + 15626209 = 6790^2 + 3953^2 .

It is a cyclic number.

It is not a de Polignac number, because 61730309 - 2⁴ = 61730293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61730303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30865154 + 30865155.

It is an arithmetic number, because the mean of its divisors is an integer number (30865155).

Almost surely, 2^61730309 is an apocalyptic number.

It is an amenable number.

61730309 is a deficient number, since it is larger than the sum of its proper divisors (1).

61730309 is an equidigital number, since it uses as much as digits as its factorization.

61730309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 29.

The square root of 61730309 is about 7856.8638145255. The cubic root of 61730309 is about 395.2144517279.

The spelling of 61730309 in words is "sixty-one million, seven hundred thirty thousand, three hundred nine".