78567161 has 2 divisors, whose sum is σ = 78567162. Its totient is φ = 78567160.

The previous prime is 78567157. The next prime is 78567227. The reversal of 78567161 is 16176587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48930025 + 29637136 = 6995^2 + 5444^2 .

It is a cyclic number.

It is not a de Polignac number, because 78567161 - 2² = 78567157 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78567131) 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, 39283580 + 39283581.

It is an arithmetic number, because the mean of its divisors is an integer number (39283581).

Almost surely, 2^78567161 is an apocalyptic number.

It is an amenable number.

78567161 is a deficient number, since it is larger than the sum of its proper divisors (1).

78567161 is an equidigital number, since it uses as much as digits as its factorization.

78567161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 78567161 is about 8863.8118775164. The cubic root of 78567161 is about 428.2989602675.

The spelling of 78567161 in words is "seventy-eight million, five hundred sixty-seven thousand, one hundred sixty-one".