61418209 has 2 divisors, whose sum is σ = 61418210. Its totient is φ = 61418208.

The previous prime is 61418207. The next prime is 61418219. The reversal of 61418209 is 90281416.

It is a happy number.

61418209 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., 61277584 + 140625 = 7828^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 61418209 - 2¹ = 61418207 is a prime.

Together with 61418207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61418207) 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, 30709104 + 30709105.

It is an arithmetic number, because the mean of its divisors is an integer number (30709105).

Almost surely, 2^61418209 is an apocalyptic number.

It is an amenable number.

61418209 is a deficient number, since it is larger than the sum of its proper divisors (1).

61418209 is an equidigital number, since it uses as much as digits as its factorization.

61418209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 61418209 is about 7836.9770319939. The cubic root of 61418209 is about 394.5472760057.

The spelling of 61418209 in words is "sixty-one million, four hundred eighteen thousand, two hundred nine".