3821278226481 has 15 divisors (see below), whose sum is σ = 5708355483963. Its totient is φ = 2547507088800.

The previous prime is 3821278226429. The next prime is 3821278226531. The reversal of 3821278226481 is 1846228721283.

It is a happy number.

The square root of 3821278226481 is 1954809.

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

3821278226481 is a `hidden beast` number, since 3 + 82 + 1 + 2 + 7 + 82 + 2 + 6 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4256388081 + 3817021838400 = 65241^2 + 1953720^2 .

It is not a de Polignac number, because 3821278226481 - 2²¹ = 3821276129329 is a prime.

It is a super-2 number, since 2×3821278226481² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3821278226881) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 17484681 + ... + 17701881.

Almost surely, 2^{3821278226481} is an apocalyptic number.

3821278226481 is the 1954809-th square number.

3821278226481 is the 977405-th centered octagonal number.

It is an amenable number.

3821278226481 is a deficient number, since it is larger than the sum of its proper divisors (1887077257482).

3821278226481 is an frugal number, since it uses more digits than its factorization.

3821278226481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434414 (or 217204 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 54.

The spelling of 3821278226481 in words is "three trillion, eight hundred twenty-one billion, two hundred seventy-eight million, two hundred twenty-six thousand, four hundred eighty-one".