321478141681 has 4 divisors (see below), whose sum is σ = 321781138164. Its totient is φ = 321175145200.

The previous prime is 321478141631. The next prime is 321478141741. The reversal of 321478141681 is 186141874123.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186141874123 = 353 ⋅527314091.

It can be written as a sum of positive squares in 2 ways, for example, as 133780377600 + 187697764081 = 365760^2 + 433241^2 .

It is a cyclic number.

It is not a de Polignac number, because 321478141681 - 2¹⁹ = 321477617393 is a prime.

It is a super-3 number, since 3×321478141681³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321478141631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151496650 + ... + 151498771.

It is an arithmetic number, because the mean of its divisors is an integer number (80445284541).

Almost surely, 2^321478141681 is an apocalyptic number.

It is an amenable number.

321478141681 is a deficient number, since it is larger than the sum of its proper divisors (302996483).

321478141681 is a wasteful number, since it uses less digits than its factorization.

321478141681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302996482.

The product of its digits is 258048, while the sum is 46.

The spelling of 321478141681 in words is "three hundred twenty-one billion, four hundred seventy-eight million, one hundred forty-one thousand, six hundred eighty-one".