181163401 has 2 divisors, whose sum is σ = 181163402. Its totient is φ = 181163400.

The previous prime is 181163383. The next prime is 181163413. The reversal of 181163401 is 104361181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165765625 + 15397776 = 12875^2 + 3924^2 .

It is a cyclic number.

It is not a de Polignac number, because 181163401 - 2⁵ = 181163369 is a prime.

It is not a weakly prime, because it can be changed into another prime (181163471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90581700 + 90581701.

It is an arithmetic number, because the mean of its divisors is an integer number (90581701).

Almost surely, 2^181163401 is an apocalyptic number.

It is an amenable number.

181163401 is a deficient number, since it is larger than the sum of its proper divisors (1).

181163401 is an equidigital number, since it uses as much as digits as its factorization.

181163401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 181163401 is about 13459.6954274605. The cubic root of 181163401 is about 565.8354528814.

The spelling of 181163401 in words is "one hundred eighty-one million, one hundred sixty-three thousand, four hundred one".