858161 has 2 divisors, whose sum is σ = 858162. Its totient is φ = 858160.

The previous prime is 858149. The next prime is 858167. The reversal of 858161 is 161858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672400 + 185761 = 820^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 858161 - 2¹⁰ = 857137 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (858167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429080 + 429081.

It is an arithmetic number, because the mean of its divisors is an integer number (429081).

2⁸⁵⁸¹⁶¹ is an apocalyptic number.

It is an amenable number.

858161 is a deficient number, since it is larger than the sum of its proper divisors (1).

858161 is an equidigital number, since it uses as much as digits as its factorization.

858161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 29.

The square root of 858161 is about 926.3697965715. The cubic root of 858161 is about 95.0290216042.

The spelling of 858161 in words is "eight hundred fifty-eight thousand, one hundred sixty-one".