398582161 has 2 divisors, whose sum is σ = 398582162. Its totient is φ = 398582160.

The previous prime is 398582141. The next prime is 398582189. The reversal of 398582161 is 161285893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397763136 + 819025 = 19944^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 398582161 - 2¹⁷ = 398451089 is a prime.

It is not a weakly prime, because it can be changed into another prime (398582131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199291080 + 199291081.

It is an arithmetic number, because the mean of its divisors is an integer number (199291081).

Almost surely, 2^398582161 is an apocalyptic number.

It is an amenable number.

398582161 is a deficient number, since it is larger than the sum of its proper divisors (1).

398582161 is an equidigital number, since it uses as much as digits as its factorization.

398582161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 398582161 is about 19964.5225587791. The cubic root of 398582161 is about 735.9347085128.

The spelling of 398582161 in words is "three hundred ninety-eight million, five hundred eighty-two thousand, one hundred sixty-one".