404681261 has 2 divisors, whose sum is σ = 404681262. Its totient is φ = 404681260.

The previous prime is 404681257. The next prime is 404681279. The reversal of 404681261 is 162186404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 288796036 + 115885225 = 16994^2 + 10765^2 .

It is a cyclic number.

It is not a de Polignac number, because 404681261 - 2² = 404681257 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404681561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202340630 + 202340631.

It is an arithmetic number, because the mean of its divisors is an integer number (202340631).

Almost surely, 2^404681261 is an apocalyptic number.

It is an amenable number.

404681261 is a deficient number, since it is larger than the sum of its proper divisors (1).

404681261 is an equidigital number, since it uses as much as digits as its factorization.

404681261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 404681261 is about 20116.6911046524. The cubic root of 404681261 is about 739.6694780331.

The spelling of 404681261 in words is "four hundred four million, six hundred eighty-one thousand, two hundred sixty-one".