78045161 has 2 divisors, whose sum is σ = 78045162. Its totient is φ = 78045160.

The previous prime is 78045137. The next prime is 78045167. The reversal of 78045161 is 16154087.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77774761 + 270400 = 8819^2 + 520^2 .

It is an emirp because it is prime and its reverse (16154087) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78045161 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78045167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39022580 + 39022581.

It is an arithmetic number, because the mean of its divisors is an integer number (39022581).

Almost surely, 2^78045161 is an apocalyptic number.

It is an amenable number.

78045161 is a deficient number, since it is larger than the sum of its proper divisors (1).

78045161 is an equidigital number, since it uses as much as digits as its factorization.

78045161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 78045161 is about 8834.3172345122. The cubic root of 78045161 is about 427.3483127470.

The spelling of 78045161 in words is "seventy-eight million, forty-five thousand, one hundred sixty-one".