400601161 has 2 divisors, whose sum is σ = 400601162. Its totient is φ = 400601160.

The previous prime is 400601059. The next prime is 400601177. The reversal of 400601161 is 161106004.

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., 357777225 + 42823936 = 18915^2 + 6544^2 .

It is a cyclic number.

It is not a de Polignac number, because 400601161 - 2²⁷ = 266383433 is a prime.

It is not a weakly prime, because it can be changed into another prime (400601191) 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, 200300580 + 200300581.

It is an arithmetic number, because the mean of its divisors is an integer number (200300581).

Almost surely, 2^400601161 is an apocalyptic number.

It is an amenable number.

400601161 is a deficient number, since it is larger than the sum of its proper divisors (1).

400601161 is an equidigital number, since it uses as much as digits as its factorization.

400601161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 400601161 is about 20015.0233824495. The cubic root of 400601161 is about 737.1752309772.

Adding to 400601161 its reverse (161106004), we get a palindrome (561707165).

The spelling of 400601161 in words is "four hundred million, six hundred one thousand, one hundred sixty-one".