404121001 has 2 divisors, whose sum is σ = 404121002. Its totient is φ = 404121000.

The previous prime is 404120953. The next prime is 404121007. The reversal of 404121001 is 100121404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240281001 + 163840000 = 15501^2 + 12800^2 .

It is a cyclic number.

It is not a de Polignac number, because 404121001 - 2²¹ = 402023849 is a prime.

It is not a weakly prime, because it can be changed into another prime (404121007) 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, 202060500 + 202060501.

It is an arithmetic number, because the mean of its divisors is an integer number (202060501).

Almost surely, 2^404121001 is an apocalyptic number.

It is an amenable number.

404121001 is a deficient number, since it is larger than the sum of its proper divisors (1).

404121001 is an equidigital number, since it uses as much as digits as its factorization.

404121001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 404121001 is about 20102.7610292716. The cubic root of 404121001 is about 739.3279758430.

Adding to 404121001 its reverse (100121404), we get a palindrome (504242405).

The spelling of 404121001 in words is "four hundred four million, one hundred twenty-one thousand, one".