61128709 has 2 divisors, whose sum is σ = 61128710. Its totient is φ = 61128708.

The previous prime is 61128707. The next prime is 61128737. The reversal of 61128709 is 90782116.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30636225 + 30492484 = 5535^2 + 5522^2 .

It is a cyclic number.

It is not a de Polignac number, because 61128709 - 2¹ = 61128707 is a prime.

Together with 61128707, it forms a pair of twin primes.

It is equal to p_3625189 and since 61128709 and 3625189 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61128703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30564354 + 30564355.

It is an arithmetic number, because the mean of its divisors is an integer number (30564355).

Almost surely, 2^61128709 is an apocalyptic number.

It is an amenable number.

61128709 is a deficient number, since it is larger than the sum of its proper divisors (1).

61128709 is an equidigital number, since it uses as much as digits as its factorization.

61128709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 61128709 is about 7818.4850834417. The cubic root of 61128709 is about 393.9263886289.

The spelling of 61128709 in words is "sixty-one million, one hundred twenty-eight thousand, seven hundred nine".