404802610081 has 3 divisors (see below), whose sum is σ = 404803246323. Its totient is φ = 404801973840.

The previous prime is 404802610019. The next prime is 404802610111. The reversal of 404802610081 is 180016208404.

The square root of 404802610081 is 636241.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 126018610081 + 278784000000 = 354991^2 + 528000^2 .

It is not a de Polignac number, because 404802610081 - 2²¹ = 404800512929 is a prime.

It is a super-2 number, since 2×404802610081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404802610001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 318121 + ... + 954361.

It is an arithmetic number, because the mean of its divisors is an integer number (134934415441).

Almost surely, 2^404802610081 is an apocalyptic number.

404802610081 is the 636241-st square number.

404802610081 is the 318121-st centered octagonal number.

It is an amenable number.

404802610081 is a deficient number, since it is larger than the sum of its proper divisors (636242).

404802610081 is an frugal number, since it uses more digits than its factorization.

404802610081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272482 (or 636241 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

Adding to 404802610081 its reverse (180016208404), we get a palindrome (584818818485).

The spelling of 404802610081 in words is "four hundred four billion, eight hundred two million, six hundred ten thousand, eighty-one".