181292161 has 2 divisors, whose sum is σ = 181292162. Its totient is φ = 181292160.

The previous prime is 181292149. The next prime is 181292203. The reversal of 181292161 is 161292181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169520400 + 11771761 = 13020^2 + 3431^2 .

It is a cyclic number.

It is not a de Polignac number, because 181292161 - 2¹⁷ = 181161089 is a 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 (181292861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90646080 + 90646081.

It is an arithmetic number, because the mean of its divisors is an integer number (90646081).

Almost surely, 2^181292161 is an apocalyptic number.

It is an amenable number.

181292161 is a deficient number, since it is larger than the sum of its proper divisors (1).

181292161 is an equidigital number, since it uses as much as digits as its factorization.

181292161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 31.

The square root of 181292161 is about 13464.4777470201. The cubic root of 181292161 is about 565.9694750193.

The spelling of 181292161 in words is "one hundred eighty-one million, two hundred ninety-two thousand, one hundred sixty-one".