78875161 has 2 divisors, whose sum is σ = 78875162. Its totient is φ = 78875160.

The previous prime is 78875143. The next prime is 78875171. The reversal of 78875161 is 16157887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71503936 + 7371225 = 8456^2 + 2715^2 .

It is an emirp because it is prime and its reverse (16157887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78875161 - 2⁷ = 78875033 is a prime.

It is not a weakly prime, because it can be changed into another prime (78875141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39437580 + 39437581.

It is an arithmetic number, because the mean of its divisors is an integer number (39437581).

Almost surely, 2^78875161 is an apocalyptic number.

It is an amenable number.

78875161 is a deficient number, since it is larger than the sum of its proper divisors (1).

78875161 is an equidigital number, since it uses as much as digits as its factorization.

78875161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 43.

The square root of 78875161 is about 8881.1688982926. The cubic root of 78875161 is about 428.8579048817.

The spelling of 78875161 in words is "seventy-eight million, eight hundred seventy-five thousand, one hundred sixty-one".