404133661 has 2 divisors, whose sum is σ = 404133662. Its totient is φ = 404133660.

The previous prime is 404133659. The next prime is 404133677. The reversal of 404133661 is 166331404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402764761 + 1368900 = 20069^2 + 1170^2 .

It is a cyclic number.

It is not a de Polignac number, because 404133661 - 2¹ = 404133659 is a prime.

Together with 404133659, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404137661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202066830 + 202066831.

It is an arithmetic number, because the mean of its divisors is an integer number (202066831).

Almost surely, 2^404133661 is an apocalyptic number.

It is an amenable number.

404133661 is a deficient number, since it is larger than the sum of its proper divisors (1).

404133661 is an equidigital number, since it uses as much as digits as its factorization.

404133661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 404133661 is about 20103.0759089250. The cubic root of 404133661 is about 739.3356961334.

The spelling of 404133661 in words is "four hundred four million, one hundred thirty-three thousand, six hundred sixty-one".