404221031161 has 2 divisors, whose sum is σ = 404221031162. Its totient is φ = 404221031160.

The previous prime is 404221031119. The next prime is 404221031219. The reversal of 404221031161 is 161130122404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387436533136 + 16784498025 = 622444^2 + 129555^2 .

It is a cyclic number.

It is not a de Polignac number, because 404221031161 - 2¹³ = 404221022969 is a prime.

It is not a weakly prime, because it can be changed into another prime (404221331161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202110515580 + 202110515581.

It is an arithmetic number, because the mean of its divisors is an integer number (202110515581).

Almost surely, 2^404221031161 is an apocalyptic number.

It is an amenable number.

404221031161 is a deficient number, since it is larger than the sum of its proper divisors (1).

404221031161 is an equidigital number, since it uses as much as digits as its factorization.

404221031161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 404221031161 its reverse (161130122404), we get a palindrome (565351153565).

The spelling of 404221031161 in words is "four hundred four billion, two hundred twenty-one million, thirty-one thousand, one hundred sixty-one".