404571121 has 2 divisors, whose sum is σ = 404571122. Its totient is φ = 404571120.

The previous prime is 404571119. The next prime is 404571137. The reversal of 404571121 is 121175404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254753521 + 149817600 = 15961^2 + 12240^2 .

It is a cyclic number.

It is not a de Polignac number, because 404571121 - 2¹ = 404571119 is a prime.

Together with 404571119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (404571221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202285560 + 202285561.

It is an arithmetic number, because the mean of its divisors is an integer number (202285561).

Almost surely, 2^404571121 is an apocalyptic number.

It is an amenable number.

404571121 is a deficient number, since it is larger than the sum of its proper divisors (1).

404571121 is an equidigital number, since it uses as much as digits as its factorization.

404571121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 404571121 is about 20113.9533906192. The cubic root of 404571121 is about 739.6023679425.

The spelling of 404571121 in words is "four hundred four million, five hundred seventy-one thousand, one hundred twenty-one".