61711409 has 2 divisors, whose sum is σ = 61711410. Its totient is φ = 61711408.

The previous prime is 61711361. The next prime is 61711427. The reversal of 61711409 is 90411716.

61711409 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., 55830784 + 5880625 = 7472^2 + 2425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61711409 is a prime.

It is not a weakly prime, because it can be changed into another prime (61711469) 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, 30855704 + 30855705.

It is an arithmetic number, because the mean of its divisors is an integer number (30855705).

Almost surely, 2^61711409 is an apocalyptic number.

It is an amenable number.

61711409 is a deficient number, since it is larger than the sum of its proper divisors (1).

61711409 is an equidigital number, since it uses as much as digits as its factorization.

61711409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 61711409 is about 7855.6609524597. The cubic root of 61711409 is about 395.1741132744.

The spelling of 61711409 in words is "sixty-one million, seven hundred eleven thousand, four hundred nine".