401216161 has 2 divisors, whose sum is σ = 401216162. Its totient is φ = 401216160.

The previous prime is 401216147. The next prime is 401216171. The reversal of 401216161 is 161612104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389825536 + 11390625 = 19744^2 + 3375^2 .

It is a cyclic number.

It is not a de Polignac number, because 401216161 - 2²¹ = 399119009 is a prime.

It is not a weakly prime, because it can be changed into another prime (401216171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200608080 + 200608081.

It is an arithmetic number, because the mean of its divisors is an integer number (200608081).

Almost surely, 2^401216161 is an apocalyptic number.

It is an amenable number.

401216161 is a deficient number, since it is larger than the sum of its proper divisors (1).

401216161 is an equidigital number, since it uses as much as digits as its factorization.

401216161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 401216161 is about 20030.3809499470. The cubic root of 401216161 is about 737.5522734565.

Adding to 401216161 its reverse (161612104), we get a palindrome (562828265).

The spelling of 401216161 in words is "four hundred one million, two hundred sixteen thousand, one hundred sixty-one".