181458161 has 2 divisors, whose sum is σ = 181458162. Its totient is φ = 181458160.

The previous prime is 181458149. The next prime is 181458203. The reversal of 181458161 is 161854181.

181458161 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., 172791025 + 8667136 = 13145^2 + 2944^2 .

It is a cyclic number.

It is not a de Polignac number, because 181458161 - 2¹⁰ = 181457137 is a prime.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (181458961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90729080 + 90729081.

It is an arithmetic number, because the mean of its divisors is an integer number (90729081).

Almost surely, 2^181458161 is an apocalyptic number.

It is an amenable number.

181458161 is a deficient number, since it is larger than the sum of its proper divisors (1).

181458161 is an equidigital number, since it uses as much as digits as its factorization.

181458161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 35.

The square root of 181458161 is about 13470.6407048811. The cubic root of 181458161 is about 566.1421654647.

The spelling of 181458161 in words is "one hundred eighty-one million, four hundred fifty-eight thousand, one hundred sixty-one".