161078081 has 2 divisors, whose sum is σ = 161078082. Its totient is φ = 161078080.

The previous prime is 161078069. The next prime is 161078123. The reversal of 161078081 is 180870161.

161078081 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., 151683856 + 9394225 = 12316^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 161078081 - 2¹⁴ = 161061697 is a prime.

It is a super-2 number, since 2×161078081² = 51892296357285122, which contains 22 as substring.

It is equal to p_9031649 and since 161078081 and 9031649 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (161078581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80539040 + 80539041.

It is an arithmetic number, because the mean of its divisors is an integer number (80539041).

Almost surely, 2^161078081 is an apocalyptic number.

It is an amenable number.

161078081 is a deficient number, since it is larger than the sum of its proper divisors (1).

161078081 is an equidigital number, since it uses as much as digits as its factorization.

161078081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 32.

The square root of 161078081 is about 12691.6539899258. The cubic root of 161078081 is about 544.1001124593.

The spelling of 161078081 in words is "one hundred sixty-one million, seventy-eight thousand, eighty-one".