324681921 has 12 divisors (see below), whose sum is σ = 469219348. Its totient is φ = 216346464.

The previous prime is 324681913. The next prime is 324681971. The reversal of 324681921 is 129186423.

324681921 is a `hidden beast` number, since 3 + 2 + 468 + 192 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61074225 + 263607696 = 7815^2 + 16236^2 .

It is not a de Polignac number, because 324681921 - 2³ = 324681913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (324681971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12771 + ... + 28503.

Almost surely, 2^324681921 is an apocalyptic number.

It is an amenable number.

324681921 is a deficient number, since it is larger than the sum of its proper divisors (144537427).

324681921 is a wasteful number, since it uses less digits than its factorization.

324681921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18032 (or 18029 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 324681921 is about 18018.9322935628. The cubic root of 324681921 is about 687.3100626157.

The spelling of 324681921 in words is "three hundred twenty-four million, six hundred eighty-one thousand, nine hundred twenty-one".