84072161 has 2 divisors, whose sum is σ = 84072162. Its totient is φ = 84072160.

The previous prime is 84072139. The next prime is 84072167. The reversal of 84072161 is 16127048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84070561 + 1600 = 9169^2 + 40^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84072161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84072167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42036080 + 42036081.

It is an arithmetic number, because the mean of its divisors is an integer number (42036081).

Almost surely, 2^84072161 is an apocalyptic number.

It is an amenable number.

84072161 is a deficient number, since it is larger than the sum of its proper divisors (1).

84072161 is an equidigital number, since it uses as much as digits as its factorization.

84072161 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 29.

The square root of 84072161 is about 9169.0872501029. The cubic root of 84072161 is about 438.0772870156.

The spelling of 84072161 in words is "eighty-four million, seventy-two thousand, one hundred sixty-one".